21540024544 has 48 divisors (see below), whose sum is σ = 43009989120. Its totient is φ = 10617412480.

The previous prime is 21540024523. The next prime is 21540024691. The reversal of 21540024544 is 44542004512.

It is a super-2 number, since 2×21540024544² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1263759 + ... + 1280689.

It is an arithmetic number, because the mean of its divisors is an integer number (896041440).

Almost surely, 2^21540024544 is an apocalyptic number.

It is an amenable number.

21540024544 is a deficient number, since it is larger than the sum of its proper divisors (21469964576).

21540024544 is a wasteful number, since it uses less digits than its factorization.

21540024544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17503 (or 17495 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 31.

The spelling of 21540024544 in words is "twenty-one billion, five hundred forty million, twenty-four thousand, five hundred forty-four".