Base | Representation |
---|---|
bin | 10100000100101111… |
… | …110111001111110000 |
3 | 2001122011120122221100 |
4 | 110010233313033300 |
5 | 323120422224100 |
6 | 13522455324400 |
7 | 1362066106500 |
oct | 240457671760 |
9 | 61564518840 |
10 | 21554492400 |
11 | 9160a49191 |
12 | 4216680700 |
13 | 205676901c |
14 | 1086931a00 |
15 | 86247b400 |
hex | 504bf73f0 |
21554492400 has 540 divisors, whose sum is σ = 88289130384. Its totient is φ = 4854528000.
The previous prime is 21554492381. The next prime is 21554492441. The reversal of 21554492400 is 429445512.
It is a happy number.
21554492400 is a `hidden beast` number, since 21 + 5 + 544 + 92 + 4 + 0 + 0 = 666.
It is a super-2 number, since 2×215544924002 (a number of 21 digits) contains 22 as substring.
It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.
It is a Harshad number since it is a multiple of its sum of digits (36).
It is a congruent number.
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 107 ways as a sum of consecutive naturals, for example, 12523540 + ... + 12525260.
Almost surely, 221554492400 is an apocalyptic number.
21554492400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 21554492400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44144565192).
21554492400 is an abundant number, since it is smaller than the sum of its proper divisors (66734637984).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
21554492400 is a wasteful number, since it uses less digits than its factorization.
21554492400 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1830 (or 1809 counting only the distinct ones).
The product of its (nonzero) digits is 57600, while the sum is 36.
The spelling of 21554492400 in words is "twenty-one billion, five hundred fifty-four million, four hundred ninety-two thousand, four hundred".
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