121012405543056 has 80 divisors (see below), whose sum is σ = 320350247521920. Its totient is φ = 39340097725440.

The previous prime is 121012405543049. The next prime is 121012405543093. The reversal of 121012405543056 is 650345504210121.

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, 4844020 + ... + 16293843.

It is an arithmetic number, because the mean of its divisors is an integer number (4004378094024).

Almost surely, 2^{121012405543056} is an apocalyptic number.

121012405543056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121012405543056 is an abundant number, since it is smaller than the sum of its proper divisors (199337841978864).

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

121012405543056 is a wasteful number, since it uses less digits than its factorization.

121012405543056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21140824 (or 21140818 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 39.

Adding to 121012405543056 its reverse (650345504210121), we get a palindrome (771357909753177).

The spelling of 121012405543056 in words is "one hundred twenty-one trillion, twelve billion, four hundred five million, five hundred forty-three thousand, fifty-six".