215556920000 has 420 divisors, whose sum is σ = 571321880976. Its totient is φ = 80636160000.

The previous prime is 215556919987. The next prime is 215556920027. The reversal of 215556920000 is 29655512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1290759917 + ... + 1290760083.

Almost surely, 2^215556920000 is an apocalyptic number.

215556920000 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 215556920000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285660940488).

215556920000 is an abundant number, since it is smaller than the sum of its proper divisors (355764960976).

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

215556920000 is an equidigital number, since it uses as much as digits as its factorization.

215556920000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 35.

The spelling of 215556920000 in words is "two hundred fifteen billion, five hundred fifty-six million, nine hundred twenty thousand".