21089832260 has 72 divisors (see below), whose sum is σ = 51542235864. Its totient is φ = 7227601920.

The previous prime is 21089832233. The next prime is 21089832311. The reversal of 21089832260 is 6223898012.

It can be written as a sum of positive squares in 4 ways, for example, as 1712635456 + 19377196804 = 41384^2 + 139202^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3620150 + ... + 3625970.

It is an arithmetic number, because the mean of its divisors is an integer number (715864387).

Almost surely, 2^21089832260 is an apocalyptic number.

21089832260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21089832260 is an abundant number, since it is smaller than the sum of its proper divisors (30452403604).

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

21089832260 is a wasteful number, since it uses less digits than its factorization.

21089832260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9541 (or 9532 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The spelling of 21089832260 in words is "twenty-one billion, eighty-nine million, eight hundred thirty-two thousand, two hundred sixty".