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121110220 = 22571178643
BaseRepresentation
bin1110011011111…
…11111011001100
322102220000222201
413031333323030
5222001011340
620003451244
73000264010
oct715777314
9272800881
10121110220
11623aa9a0
1234686b24
131c12536a
1412128540
15a97479a
hex737fecc

121110220 has 48 divisors (see below), whose sum is σ = 317092608. Its totient is φ = 37748160.

The previous prime is 121110191. The next prime is 121110233. The reversal of 121110220 is 22011121.

121110220 is nontrivially palindromic in base 15.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 121110197 and 121110206.

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, 37782 + ... + 40861.

It is an arithmetic number, because the mean of its divisors is an integer number (6606096).

Almost surely, 2121110220 is an apocalyptic number.

121110220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121110220 is an abundant number, since it is smaller than the sum of its proper divisors (195982388).

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

121110220 is a wasteful number, since it uses less digits than its factorization.

121110220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78670 (or 78668 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 121110220 is about 11005.0088596057. The cubic root of 121110220 is about 494.7588799480.

Adding to 121110220 its reverse (22011121), we get a palindrome (143121341).

Subtracting from 121110220 its reverse (22011121), we obtain a palindrome (99099099).

The spelling of 121110220 in words is "one hundred twenty-one million, one hundred ten thousand, two hundred twenty".

Divisors: 1 2 4 5 7 10 11 14 20 22 28 35 44 55 70 77 110 140 154 220 308 385 770 1540 78643 157286 314572 393215 550501 786430 865073 1101002 1572860 1730146 2202004 2752505 3460292 4325365 5505010 6055511 8650730 11010020 12111022 17301460 24222044 30277555 60555110 121110220