121072785855 has 32 divisors (see below), whose sum is σ = 224508423168. Its totient is φ = 54568012800.

The previous prime is 121072785851. The next prime is 121072785871. The reversal of 121072785855 is 558587270121.

It is not a de Polignac number, because 121072785855 - 2² = 121072785851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121072785798 and 121072785807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121072785851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8112786 + ... + 8127695.

It is an arithmetic number, because the mean of its divisors is an integer number (7015888224).

Almost surely, 2^121072785855 is an apocalyptic number.

121072785855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121072785855 is a deficient number, since it is larger than the sum of its proper divisors (103435637313).

121072785855 is a wasteful number, since it uses less digits than its factorization.

121072785855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16240567.

The product of its (nonzero) digits is 1568000, while the sum is 51.

The spelling of 121072785855 in words is "one hundred twenty-one billion, seventy-two million, seven hundred eighty-five thousand, eight hundred fifty-five".