21507336260 has 12 divisors (see below), whose sum is σ = 45165406188. Its totient is φ = 8602934496.

The previous prime is 21507336251. The next prime is 21507336269. The reversal of 21507336260 is 6263370512.

It is an interprime number because it is at equal distance from previous prime (21507336251) and next prime (21507336269).

It can be written as a sum of positive squares in 2 ways, for example, as 9209857024 + 12297479236 = 95968^2 + 110894^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21507336260.

It is not an unprimeable number, because it can be changed into a prime (21507336269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 537683387 + ... + 537683426.

It is an arithmetic number, because the mean of its divisors is an integer number (3763783849).

Almost surely, 2^21507336260 is an apocalyptic number.

21507336260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21507336260 is an abundant number, since it is smaller than the sum of its proper divisors (23658069928).

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

21507336260 is a wasteful number, since it uses less digits than its factorization.

21507336260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075366822 (or 1075366820 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 35.

The spelling of 21507336260 in words is "twenty-one billion, five hundred seven million, three hundred thirty-six thousand, two hundred sixty".