21631644613612 has 24 divisors (see below), whose sum is σ = 41481963436032. Its totient is φ = 9788473506000.

The previous prime is 21631644613573. The next prime is 21631644613643.

21631644613612 is nontrivially palindromic in base 10.

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, 1102295764 + ... + 1102315387.

It is an arithmetic number, because the mean of its divisors is an integer number (1728415143168).

Almost surely, 2^{21631644613612} is an apocalyptic number.

21631644613612 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21631644613612 is a deficient number, since it is larger than the sum of its proper divisors (19850318822420).

21631644613612 is a wasteful number, since it uses less digits than its factorization.

21631644613612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2204611389 (or 2204611387 counting only the distinct ones).

The product of its digits is 746496, while the sum is 46.

It can be divided in two parts, 2163164 and 4613612, that added together give a palindrome (6776776).

The spelling of 21631644613612 in words is "twenty-one trillion, six hundred thirty-one billion, six hundred forty-four million, six hundred thirteen thousand, six hundred twelve".