21732728260 has 48 divisors (see below), whose sum is σ = 48345534720. Its totient is φ = 8177978880.

The previous prime is 21732728233. The next prime is 21732728321. The reversal of 21732728260 is 6282723712.

It is a super-2 number, since 2×21732728260² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 792661 + ... + 819619.

It is an arithmetic number, because the mean of its divisors is an integer number (1007198640).

Almost surely, 2^21732728260 is an apocalyptic number.

21732728260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21732728260 is an abundant number, since it is smaller than the sum of its proper divisors (26612806460).

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

21732728260 is a wasteful number, since it uses less digits than its factorization.

21732728260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29356 (or 29354 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 40.

The spelling of 21732728260 in words is "twenty-one billion, seven hundred thirty-two million, seven hundred twenty-eight thousand, two hundred sixty".