21170832004 has 81 divisors (see below), whose sum is σ = 45568759383. Its totient is φ = 8579961936.

The previous prime is 21170831971. The next prime is 21170832041. The reversal of 21170832004 is 40023807112.

The square root of 21170832004 is 145502.

It is a perfect power (a square), and thus also a powerful number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 38703259 + ... + 38703805.

Almost surely, 2^21170832004 is an apocalyptic number.

21170832004 is the 145502-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21170832004

21170832004 is an abundant number, since it is smaller than the sum of its proper divisors (24397927379).

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

21170832004 is an equidigital number, since it uses as much as digits as its factorization.

21170832004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150 (or 575 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The spelling of 21170832004 in words is "twenty-one billion, one hundred seventy million, eight hundred thirty-two thousand, four".