121756525472 has 96 divisors (see below), whose sum is σ = 248643743040. Its totient is φ = 58651084800.

The previous prime is 121756525441. The next prime is 121756525481. The reversal of 121756525472 is 274525657121.

It is a happy number.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64047722 + ... + 64049622.

It is an arithmetic number, because the mean of its divisors is an integer number (2590038990).

Almost surely, 2^121756525472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121756525472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124321871520).

121756525472 is an abundant number, since it is smaller than the sum of its proper divisors (126887217568).

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

121756525472 is a wasteful number, since it uses less digits than its factorization.

121756525472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2566 (or 2558 counting only the distinct ones).

The product of its digits is 1176000, while the sum is 47.

The spelling of 121756525472 in words is "one hundred twenty-one billion, seven hundred fifty-six million, five hundred twenty-five thousand, four hundred seventy-two".