21244236531 has 32 divisors (see below), whose sum is σ = 33020510208. Its totient is φ = 11898744480.

The previous prime is 21244236527. The next prime is 21244236539. The reversal of 21244236531 is 13563244212.

It is not a de Polignac number, because 21244236531 - 2² = 21244236527 is a prime.

It is a super-2 number, since 2×21244236531² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21244236492 and 21244236501.

It is not an unprimeable number, because it can be changed into a prime (21244236539) 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 31 ways as a sum of consecutive naturals, for example, 173376 + ... + 269346.

It is an arithmetic number, because the mean of its divisors is an integer number (1031890944).

Almost surely, 2^21244236531 is an apocalyptic number.

21244236531 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21244236531 is a deficient number, since it is larger than the sum of its proper divisors (11776273677).

21244236531 is a wasteful number, since it uses less digits than its factorization.

21244236531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96191.

The product of its digits is 34560, while the sum is 33.

The spelling of 21244236531 in words is "twenty-one billion, two hundred forty-four million, two hundred thirty-six thousand, five hundred thirty-one".