215843921220 has 96 divisors (see below), whose sum is σ = 636603811200. Its totient is φ = 54491940864.

The previous prime is 215843921213. The next prime is 215843921231. The reversal of 215843921220 is 22129348512.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1633882 + ... + 1761038.

It is an arithmetic number, because the mean of its divisors is an integer number (6631289700).

Almost surely, 2^215843921220 is an apocalyptic number.

215843921220 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 215843921220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (318301905600).

215843921220 is an abundant number, since it is smaller than the sum of its proper divisors (420759889980).

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

215843921220 is a wasteful number, since it uses less digits than its factorization.

215843921220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128677 (or 128675 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The spelling of 215843921220 in words is "two hundred fifteen billion, eight hundred forty-three million, nine hundred twenty-one thousand, two hundred twenty".