2121715909164 has 96 divisors (see below), whose sum is σ = 5045847206400. Its totient is φ = 693697743360.

The previous prime is 2121715909123. The next prime is 2121715909171. The reversal of 2121715909164 is 4619095171212.

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 31 ways as a sum of consecutive naturals, for example, 1129171977 + ... + 1129173855.

It is an arithmetic number, because the mean of its divisors is an integer number (52560908400).

Almost surely, 2^{2121715909164} is an apocalyptic number.

It is an amenable number.

2121715909164 is an abundant number, since it is smaller than the sum of its proper divisors (2924131297236).

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

2121715909164 is a wasteful number, since it uses less digits than its factorization.

2121715909164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4663 (or 4661 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 48.

The spelling of 2121715909164 in words is "two trillion, one hundred twenty-one billion, seven hundred fifteen million, nine hundred nine thousand, one hundred sixty-four".