121351256555056 has 60 divisors (see below), whose sum is σ = 262075490751312. Its totient is φ = 54382765360000.

The previous prime is 121351256555047. The next prime is 121351256555063. The reversal of 121351256555056 is 650555652153121.

It is a super-2 number, since 2×121351256555056² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121351256554994 and 121351256555012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 441281095 + ... + 441556006.

Almost surely, 2^{121351256555056} is an apocalyptic number.

121351256555056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121351256555056 is an abundant number, since it is smaller than the sum of its proper divisors (140724234196256).

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

121351256555056 is a wasteful number, since it uses less digits than its factorization.

121351256555056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882837202 (or 882837185 counting only the distinct ones).

The product of its (nonzero) digits is 6750000, while the sum is 52.

The spelling of 121351256555056 in words is "one hundred twenty-one trillion, three hundred fifty-one billion, two hundred fifty-six million, five hundred fifty-five thousand, fifty-six".