21334131531 has 12 divisors (see below), whose sum is σ = 30821437920. Its totient is φ = 14220229680.

The previous prime is 21334131529. The next prime is 21334131541. The reversal of 21334131531 is 13513143312.

21334131531 is a `hidden beast` number, since 2 + 1 + 3 + 341 + 315 + 3 + 1 = 666.

It is not a de Polignac number, because 21334131531 - 2¹ = 21334131529 is a prime.

It is a super-2 number, since 2×21334131531² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21334131495 and 21334131504.

It is not an unprimeable number, because it can be changed into a prime (21334131541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 156136 + ... + 258933.

It is an arithmetic number, because the mean of its divisors is an integer number (2568453160).

Almost surely, 2^21334131531 is an apocalyptic number.

21334131531 is a deficient number, since it is larger than the sum of its proper divisors (9487306389).

21334131531 is a wasteful number, since it uses less digits than its factorization.

21334131531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420786 (or 420783 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

Adding to 21334131531 its reverse (13513143312), we get a palindrome (34847274843).

The spelling of 21334131531 in words is "twenty-one billion, three hundred thirty-four million, one hundred thirty-one thousand, five hundred thirty-one".