21110532531 has 24 divisors (see below), whose sum is σ = 31658383680. Its totient is φ = 12496711920.

The previous prime is 21110532511. The next prime is 21110532539. The reversal of 21110532531 is 13523501112.

It is not a de Polignac number, because 21110532531 - 2⁶ = 21110532467 is a prime.

It is a super-2 number, since 2×21110532531² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21110532539) 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 23 ways as a sum of consecutive naturals, for example, 660621 + ... + 691838.

It is an arithmetic number, because the mean of its divisors is an integer number (1319099320).

Almost surely, 2^21110532531 is an apocalyptic number.

21110532531 is a deficient number, since it is larger than the sum of its proper divisors (10547851149).

21110532531 is a wasteful number, since it uses less digits than its factorization.

21110532531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1352527 (or 1352516 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The spelling of 21110532531 in words is "twenty-one billion, one hundred ten million, five hundred thirty-two thousand, five hundred thirty-one".