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21105044880 = 2435175949993
BaseRepresentation
bin10011101001111101…
…010110110110010000
32000110211212100211220
4103221331112312100
5321210342414010
613410122205040
71345000631043
oct235175266620
960424770756
1021105044880
118a5027a657
124110053780
131cb460394a
141042d78c5a
15837c9b970
hex4e9f56d90

21105044880 has 80 divisors (see below), whose sum is σ = 65464143360. Its totient is φ = 5624699904.

The previous prime is 21105044879. The next prime is 21105044899. The reversal of 21105044880 is 8844050112.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 397164 + ... + 447156.

It is an arithmetic number, because the mean of its divisors is an integer number (818301792).

Almost surely, 221105044880 is an apocalyptic number.

21105044880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21105044880 is an abundant number, since it is smaller than the sum of its proper divisors (44359098480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21105044880 is a wasteful number, since it uses less digits than its factorization.

21105044880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51768 (or 51762 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 33.

Adding to 21105044880 its reverse (8844050112), we get a palindrome (29949094992).

The spelling of 21105044880 in words is "twenty-one billion, one hundred five million, forty-four thousand, eight hundred eighty".

Divisors: 1 2 3 4 5 6 8 10 12 15 16 20 24 30 40 48 60 80 120 240 1759 3518 5277 7036 8795 10554 14072 17590 21108 26385 28144 35180 42216 49993 52770 70360 84432 99986 105540 140720 149979 199972 211080 249965 299958 399944 422160 499930 599916 749895 799888 999860 1199832 1499790 1999720 2399664 2999580 3999440 5999160 11998320 87937687 175875374 263813061 351750748 439688435 527626122 703501496 879376870 1055252244 1319065305 1407002992 1758753740 2110504488 2638130610 3517507480 4221008976 5276261220 7035014960 10552522440 21105044880