121556976440 has 32 divisors (see below), whose sum is σ = 273513240000. Its totient is φ = 48621005184.

The previous prime is 121556976389. The next prime is 121556976467. The reversal of 121556976440 is 44679655121.

It is a congruent number.

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, 1855361 + ... + 1919759.

It is an arithmetic number, because the mean of its divisors is an integer number (8547288750).

Almost surely, 2^121556976440 is an apocalyptic number.

121556976440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121556976440 is an abundant number, since it is smaller than the sum of its proper divisors (151956263560).

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

121556976440 is a wasteful number, since it uses less digits than its factorization.

121556976440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111599 (or 111595 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 121556976440 in words is "one hundred twenty-one billion, five hundred fifty-six million, nine hundred seventy-six thousand, four hundred forty".