21540024612 has 36 divisors (see below), whose sum is σ = 55606876416. Its totient is φ = 7027241520.

The previous prime is 21540024523. The next prime is 21540024691. The reversal of 21540024612 is 21642004512.

21540024612 is a `hidden beast` number, since 2 + 1 + 5 + 40 + 0 + 2 + 4 + 612 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6363564 + ... + 6366947.

It is an arithmetic number, because the mean of its divisors is an integer number (1544635456).

Almost surely, 2^21540024612 is an apocalyptic number.

It is an amenable number.

21540024612 is an abundant number, since it is smaller than the sum of its proper divisors (34066851804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21540024612 is a wasteful number, since it uses less digits than its factorization.

21540024612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12730568 (or 12730563 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The spelling of 21540024612 in words is "twenty-one billion, five hundred forty million, twenty-four thousand, six hundred twelve".