21507600460764 has 48 divisors (see below), whose sum is σ = 54790877344896. Its totient is φ = 6512185876800.

The previous prime is 21507600460729. The next prime is 21507600460807. The reversal of 21507600460764 is 46706400670512.

It is a congruent number.

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, 65696202 + ... + 66022769.

It is an arithmetic number, because the mean of its divisors is an integer number (1141476611352).

Almost surely, 2^{21507600460764} is an apocalyptic number.

It is an amenable number.

21507600460764 is an abundant number, since it is smaller than the sum of its proper divisors (33283276884132).

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

21507600460764 is a wasteful number, since it uses less digits than its factorization.

21507600460764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131720226 (or 131720224 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 48.

The spelling of 21507600460764 in words is "twenty-one trillion, five hundred seven billion, six hundred million, four hundred sixty thousand, seven hundred sixty-four".