21123321213112 has 16 divisors (see below), whose sum is σ = 39606499206360. Its totient is φ = 10561588091424.

The previous prime is 21123321213109. The next prime is 21123321213133. The reversal of 21123321213112 is 21131212332112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7816278 + ... + 10165669.

Almost surely, 2^{21123321213112} is an apocalyptic number.

It is an amenable number.

21123321213112 is a deficient number, since it is larger than the sum of its proper divisors (18483177993248).

21123321213112 is a wasteful number, since it uses less digits than its factorization.

21123321213112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18128790 (or 18128786 counting only the distinct ones).

The product of its digits is 864, while the sum is 25.

Adding to 21123321213112 its reverse (21131212332112), we get a palindrome (42254533545224).

The spelling of 21123321213112 in words is "twenty-one trillion, one hundred twenty-three billion, three hundred twenty-one million, two hundred thirteen thousand, one hundred twelve".