21262248531 has 12 divisors (see below), whose sum is σ = 31170527752. Its totient is φ = 13963267296.

The previous prime is 21262248523. The next prime is 21262248533. The reversal of 21262248531 is 13584226212.

21262248531 is a `hidden beast` number, since 2 + 126 + 22 + 485 + 31 = 666.

It is not a de Polignac number, because 21262248531 - 2³ = 21262248523 is a prime.

It is a super-2 number, since 2×21262248531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21262248533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17629786 + ... + 17630991.

Almost surely, 2^21262248531 is an apocalyptic number.

21262248531 is a deficient number, since it is larger than the sum of its proper divisors (9908279221).

21262248531 is a wasteful number, since it uses less digits than its factorization.

21262248531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35260850 (or 35260847 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The spelling of 21262248531 in words is "twenty-one billion, two hundred sixty-two million, two hundred forty-eight thousand, five hundred thirty-one".