21364127577531 has 20 divisors (see below), whose sum is σ = 31915977439632. Its totient is φ = 14242009372848.

The previous prime is 21364127577511. The next prime is 21364127577557. The reversal of 21364127577531 is 13577572146312.

21364127577531 is a `hidden beast` number, since 2 + 1 + 3 + 6 + 4 + 12 + 7 + 577 + 53 + 1 = 666.

It is not a de Polignac number, because 21364127577531 - 2⁶ = 21364127577467 is a prime.

It is a super-2 number, since 2×21364127577531² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21364127577511) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5307711 + ... + 8420216.

Almost surely, 2^{21364127577531} is an apocalyptic number.

21364127577531 is a deficient number, since it is larger than the sum of its proper divisors (10551849862101).

21364127577531 is a wasteful number, since it uses less digits than its factorization.

21364127577531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13747152 (or 13747143 counting only the distinct ones).

The product of its digits is 7408800, while the sum is 54.

The spelling of 21364127577531 in words is "twenty-one trillion, three hundred sixty-four billion, one hundred twenty-seven million, five hundred seventy-seven thousand, five hundred thirty-one".