121561562512 has 40 divisors (see below), whose sum is σ = 253663859960. Its totient is φ = 56100695040.

The previous prime is 121561562509. The next prime is 121561562543. The reversal of 121561562512 is 215265165121.

It can be written as a sum of positive squares in 4 ways, for example, as 43204116736 + 78357445776 = 207856^2 + 279924^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5015062 + ... + 5039242.

It is an arithmetic number, because the mean of its divisors is an integer number (6341596499).

Almost surely, 2^121561562512 is an apocalyptic number.

It is an amenable number.

121561562512 is an abundant number, since it is smaller than the sum of its proper divisors (132102297448).

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

121561562512 is a wasteful number, since it uses less digits than its factorization.

121561562512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48371 (or 48365 counting only the distinct ones).

The product of its digits is 36000, while the sum is 37.

The spelling of 121561562512 in words is "one hundred twenty-one billion, five hundred sixty-one million, five hundred sixty-two thousand, five hundred twelve".