21630013123612 has 24 divisors (see below), whose sum is σ = 39844911285200. Its totient is φ = 10245757049856.

The previous prime is 21630013123591. The next prime is 21630013123613. The reversal of 21630013123612 is 21632131003612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21630013123613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36051214 + ... + 36646282.

Almost surely, 2^{21630013123612} is an apocalyptic number.

It is an amenable number.

21630013123612 is a deficient number, since it is larger than the sum of its proper divisors (18214898161588).

21630013123612 is a wasteful number, since it uses less digits than its factorization.

21630013123612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073365 (or 1073363 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 31.

The spelling of 21630013123612 in words is "twenty-one trillion, six hundred thirty billion, thirteen million, one hundred twenty-three thousand, six hundred twelve".