21511374760 has 32 divisors (see below), whose sum is σ = 48944428200. Its totient is φ = 8507868160.

The previous prime is 21511374743. The next prime is 21511374877. The reversal of 21511374760 is 6747311512.

It can be written as a sum of positive squares in 4 ways, for example, as 9903036196 + 11608338564 = 99514^2 + 107742^2 .

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, 3017701 + ... + 3024820.

Almost surely, 2^21511374760 is an apocalyptic number.

21511374760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21511374760 is an abundant number, since it is smaller than the sum of its proper divisors (27433053440).

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

21511374760 is a wasteful number, since it uses less digits than its factorization.

21511374760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6042621 (or 6042617 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 37.

The spelling of 21511374760 in words is "twenty-one billion, five hundred eleven million, three hundred seventy-four thousand, seven hundred sixty".