21663653031 has 12 divisors (see below), whose sum is σ = 31363229040. Its totient is φ = 14409534240.

The previous prime is 21663653023. The next prime is 21663653101. The reversal of 21663653031 is 13035636612.

21663653031 is a `hidden beast` number, since 2 + 1 + 66 + 36 + 530 + 31 = 666.

It is not a de Polignac number, because 21663653031 - 2³ = 21663653023 is a prime.

It is a super-2 number, since 2×21663653031² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21663553031) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2737590 + ... + 2745491.

It is an arithmetic number, because the mean of its divisors is an integer number (2613602420).

Almost surely, 2^21663653031 is an apocalyptic number.

21663653031 is a deficient number, since it is larger than the sum of its proper divisors (9699576009).

21663653031 is a wasteful number, since it uses less digits than its factorization.

21663653031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5483526 (or 5483523 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 36.

The spelling of 21663653031 in words is "twenty-one billion, six hundred sixty-three million, six hundred fifty-three thousand, thirty-one".