21640056890484 has 24 divisors (see below), whose sum is σ = 51667732732000. Its totient is φ = 7045599917664.

The previous prime is 21640056890401. The next prime is 21640056890633. The reversal of 21640056890484 is 48409865004612.

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, 20969046859 + ... + 20969047890.

Almost surely, 2^{21640056890484} is an apocalyptic number.

It is an amenable number.

21640056890484 is an abundant number, since it is smaller than the sum of its proper divisors (30027675841516).

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

21640056890484 is a wasteful number, since it uses less digits than its factorization.

21640056890484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41938094799 (or 41938094797 counting only the distinct ones).

The product of its (nonzero) digits is 13271040, while the sum is 57.

The spelling of 21640056890484 in words is "twenty-one trillion, six hundred forty billion, fifty-six million, eight hundred ninety thousand, four hundred eighty-four".