21653300656323 has 72 divisors (see below), whose sum is σ = 38659769065008. Its totient is φ = 11604321404928.

The previous prime is 21653300656303. The next prime is 21653300656387. The reversal of 21653300656323 is 32365600335612.

It is a happy number.

21653300656323 is a `hidden beast` number, since 2 + 1 + 6 + 5 + 3 + 3 + 0 + 0 + 6 + 5 + 632 + 3 = 666.

It is not a de Polignac number, because 21653300656323 - 2¹³ = 21653300648131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21653300656303) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2981286 + ... + 7224587.

It is an arithmetic number, because the mean of its divisors is an integer number (536941237014).

Almost surely, 2^{21653300656323} is an apocalyptic number.

21653300656323 is a deficient number, since it is larger than the sum of its proper divisors (17006468408685).

21653300656323 is a wasteful number, since it uses less digits than its factorization.

21653300656323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10206193 (or 10206183 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 45.

The spelling of 21653300656323 in words is "twenty-one trillion, six hundred fifty-three billion, three hundred million, six hundred fifty-six thousand, three hundred twenty-three".