21631211213612 has 144 divisors (see below), whose sum is σ = 53991405581568. Its totient is φ = 7321841095680.

The previous prime is 21631211213603. The next prime is 21631211213627.

21631211213612 is nontrivially palindromic in base 10.

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, 8189558 + ... + 10503869.

Almost surely, 2^{21631211213612} is an apocalyptic number.

21631211213612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21631211213612 is an abundant number, since it is smaller than the sum of its proper divisors (32360194367956).

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

21631211213612 is a wasteful number, since it uses less digits than its factorization.

21631211213612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18693496 (or 18693477 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

It can be divided in two parts, 2163121 and 1213612, that added together give a palindrome (3376733).

The spelling of 21631211213612 in words is "twenty-one trillion, six hundred thirty-one billion, two hundred eleven million, two hundred thirteen thousand, six hundred twelve".