21631431570074 has 16 divisors (see below), whose sum is σ = 32464880960640. Its totient is φ = 10809805116960.

The previous prime is 21631431570017. The next prime is 21631431570083. The reversal of 21631431570074 is 47007513413612.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89002142 + ... + 89244854.

It is an arithmetic number, because the mean of its divisors is an integer number (2029055060040).

Almost surely, 2^{21631431570074} is an apocalyptic number.

21631431570074 is a deficient number, since it is larger than the sum of its proper divisors (10833449390566).

21631431570074 is a wasteful number, since it uses less digits than its factorization.

21631431570074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266885.

The product of its (nonzero) digits is 423360, while the sum is 44.

Adding to 21631431570074 its reverse (47007513413612), we get a palindrome (68638944983686).

The spelling of 21631431570074 in words is "twenty-one trillion, six hundred thirty-one billion, four hundred thirty-one million, five hundred seventy thousand, seventy-four".