21510795372 has 48 divisors (see below), whose sum is σ = 55296912384. Its totient is φ = 6453880000.

The previous prime is 21510795367. The next prime is 21510795391. The reversal of 21510795372 is 27359701512.

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, 793404 + ... + 820067.

It is an arithmetic number, because the mean of its divisors is an integer number (1152019008).

Almost surely, 2^21510795372 is an apocalyptic number.

21510795372 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21510795372 is an abundant number, since it is smaller than the sum of its proper divisors (33786117012).

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

21510795372 is a wasteful number, since it uses less digits than its factorization.

21510795372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613590 (or 1613588 counting only the distinct ones).

The product of its (nonzero) digits is 132300, while the sum is 42.

The spelling of 21510795372 in words is "twenty-one billion, five hundred ten million, seven hundred ninety-five thousand, three hundred seventy-two".