121115255511552 has 320 divisors, whose sum is σ = 342898908422400. Its totient is φ = 37915839037440.

The previous prime is 121115255511529. The next prime is 121115255511619. The reversal of 121115255511552 is 255115552511121.

It is a super-2 number, since 2×121115255511552² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8057690277 + ... + 8057705307.

It is an arithmetic number, because the mean of its divisors is an integer number (1071559088820).

Almost surely, 2^{121115255511552} is an apocalyptic number.

121115255511552 is a gapful number since it is divisible by the number (12) 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 121115255511552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171449454211200).

121115255511552 is an abundant number, since it is smaller than the sum of its proper divisors (221783652910848).

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

121115255511552 is a wasteful number, since it uses less digits than its factorization.

121115255511552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20007 (or 19991 counting only the distinct ones).

The product of its digits is 125000, while the sum is 42.

The spelling of 121115255511552 in words is "one hundred twenty-one trillion, one hundred fifteen billion, two hundred fifty-five million, five hundred eleven thousand, five hundred fifty-two".