21401620110631 has 16 divisors (see below), whose sum is σ = 21780440478720. Its totient is φ = 21023339654880.

The previous prime is 21401620110599. The next prime is 21401620110679. The reversal of 21401620110631 is 13601102610412.

It is a cyclic number.

It is not a de Polignac number, because 21401620110631 - 2⁵ = 21401620110599 is a prime.

It is a super-2 number, since 2×21401620110631² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21401620110631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21401620110131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 973188046 + ... + 973210036.

It is an arithmetic number, because the mean of its divisors is an integer number (1361277529920).

Almost surely, 2^{21401620110631} is an apocalyptic number.

21401620110631 is a deficient number, since it is larger than the sum of its proper divisors (378820368089).

21401620110631 is a wasteful number, since it uses less digits than its factorization.

21401620110631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33486.

The product of its (nonzero) digits is 1728, while the sum is 28.

The spelling of 21401620110631 in words is "twenty-one trillion, four hundred one billion, six hundred twenty million, one hundred ten thousand, six hundred thirty-one".