21491610331022 has 32 divisors (see below), whose sum is σ = 34783607138112. Its totient is φ = 9900242233344.

The previous prime is 21491610330961. The next prime is 21491610331159. The reversal of 21491610331022 is 22013301619412.

It is a happy number.

It is a congruent number.

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, 85641143 + ... + 85891725.

It is an arithmetic number, because the mean of its divisors is an integer number (1086987723066).

Almost surely, 2^{21491610331022} is an apocalyptic number.

21491610331022 is a deficient number, since it is larger than the sum of its proper divisors (13291996807090).

21491610331022 is a wasteful number, since it uses less digits than its factorization.

21491610331022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256892.

The product of its (nonzero) digits is 15552, while the sum is 35.

The spelling of 21491610331022 in words is "twenty-one trillion, four hundred ninety-one billion, six hundred ten million, three hundred thirty-one thousand, twenty-two".