21365626734231 has 32 divisors (see below), whose sum is σ = 31254129607680. Its totient is φ = 12902529225600.

The previous prime is 21365626734223. The next prime is 21365626734259. The reversal of 21365626734231 is 13243762656312.

It is a happy number.

It is not a de Polignac number, because 21365626734231 - 2³ = 21365626734223 is a prime.

It is a super-2 number, since 2×21365626734231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21365626734281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9393361 + ... + 11444058.

It is an arithmetic number, because the mean of its divisors is an integer number (976691550240).

Almost surely, 2^{21365626734231} is an apocalyptic number.

21365626734231 is a deficient number, since it is larger than the sum of its proper divisors (9888502873449).

21365626734231 is a wasteful number, since it uses less digits than its factorization.

21365626734231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20837927.

The product of its digits is 6531840, while the sum is 51.

The spelling of 21365626734231 in words is "twenty-one trillion, three hundred sixty-five billion, six hundred twenty-six million, seven hundred thirty-four thousand, two hundred thirty-one".