21618460536 has 16 divisors (see below), whose sum is σ = 54046151400. Its totient is φ = 7206153504.

The previous prime is 21618460517. The next prime is 21618460559. The reversal of 21618460536 is 63506481612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 450384571 + ... + 450384618.

Almost surely, 2^21618460536 is an apocalyptic number.

It is an amenable number.

21618460536 is an abundant number, since it is smaller than the sum of its proper divisors (32427690864).

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

21618460536 is a wasteful number, since it uses less digits than its factorization.

21618460536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900769198 (or 900769194 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 21618460536 in words is "twenty-one billion, six hundred eighteen million, four hundred sixty thousand, five hundred thirty-six".