21831688613812 has 36 divisors (see below), whose sum is σ = 48483360432864. Its totient is φ = 8505852705840.

The previous prime is 21831688613753. The next prime is 21831688613821.

21831688613812 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5063005408 + ... + 5063009719.

It is an arithmetic number, because the mean of its divisors is an integer number (1346760012024).

Almost surely, 2^{21831688613812} is an apocalyptic number.

21831688613812 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21831688613812 is an abundant number, since it is smaller than the sum of its proper divisors (26651671819052).

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

21831688613812 is a wasteful number, since it uses less digits than its factorization.

21831688613812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10126015156 (or 10126015147 counting only the distinct ones).

The product of its digits is 5308416, while the sum is 58.

The spelling of 21831688613812 in words is "twenty-one trillion, eight hundred thirty-one billion, six hundred eighty-eight million, six hundred thirteen thousand, eight hundred twelve".