21570885000 has 720 divisors, whose sum is σ = 87994832640. Its totient is φ = 4669920000.

The previous prime is 21570884989. The next prime is 21570885001. The reversal of 21570885000 is 58807512.

21570885000 is a `hidden beast` number, since 2 + 1 + 5 + 70 + 88 + 500 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21570885001) by changing a digit.

It is a polite number, since it can be written in 179 ways as a sum of consecutive naturals, for example, 458954977 + ... + 458955023.

Almost surely, 2^21570885000 is an apocalyptic number.

21570885000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21570885000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43997416320).

21570885000 is an abundant number, since it is smaller than the sum of its proper divisors (66423947640).

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

21570885000 is a wasteful number, since it uses less digits than its factorization.

21570885000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The spelling of 21570885000 in words is "twenty-one billion, five hundred seventy million, eight hundred eighty-five thousand".