21170960992090 has 96 divisors (see below), whose sum is σ = 47820689933184. Its totient is φ = 6688844588160.

The previous prime is 21170960991997. The next prime is 21170960992141. The reversal of 21170960992090 is 9029906907112.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 908235 + ... + 6570145.

It is an arithmetic number, because the mean of its divisors is an integer number (498132186804).

Almost surely, 2^{21170960992090} is an apocalyptic number.

21170960992090 is an abundant number, since it is smaller than the sum of its proper divisors (26649728941094).

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

21170960992090 is a wasteful number, since it uses less digits than its factorization.

21170960992090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5662532 (or 5662525 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 55.

The spelling of 21170960992090 in words is "twenty-one trillion, one hundred seventy billion, nine hundred sixty million, nine hundred ninety-two thousand, ninety".