121115856 has 40 divisors (see below), whose sum is σ = 313283520. Its totient is φ = 40320256.

The previous prime is 121115831. The next prime is 121115857. The reversal of 121115856 is 658511121.

It is a super-2 number, since 2×121115856² = 29338101149225472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121115857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62356 + ... + 64268.

It is an arithmetic number, because the mean of its divisors is an integer number (7832088).

Almost surely, 2^121115856 is an apocalyptic number.

121115856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121115856 is an abundant number, since it is smaller than the sum of its proper divisors (192167664).

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

121115856 is a wasteful number, since it uses less digits than its factorization.

121115856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3243 (or 3237 counting only the distinct ones).

The product of its digits is 2400, while the sum is 30.

The square root of 121115856 is about 11005.2649218454. The cubic root of 121115856 is about 494.7665545489.

Adding to 121115856 its reverse (658511121), we get a palindrome (779626977).

The spelling of 121115856 in words is "one hundred twenty-one million, one hundred fifteen thousand, eight hundred fifty-six".