21481567532 has 48 divisors (see below), whose sum is σ = 39131769600. Its totient is φ = 10305906240.

The previous prime is 21481567463. The next prime is 21481567543. The reversal of 21481567532 is 23576518412.

It is a super-2 number, since 2×21481567532² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21080519 + ... + 21081537.

It is an arithmetic number, because the mean of its divisors is an integer number (815245200).

Almost surely, 2^21481567532 is an apocalyptic number.

It is an amenable number.

21481567532 is a deficient number, since it is larger than the sum of its proper divisors (17650202068).

21481567532 is a wasteful number, since it uses less digits than its factorization.

21481567532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2006 (or 2004 counting only the distinct ones).

The product of its digits is 403200, while the sum is 44.

The spelling of 21481567532 in words is "twenty-one billion, four hundred eighty-one million, five hundred sixty-seven thousand, five hundred thirty-two".