215172220975920 has 480 divisors, whose sum is σ = 803403802865664. Its totient is φ = 51250897152000.

The previous prime is 215172220975913. The next prime is 215172220975927. The reversal of 215172220975920 is 29579022271512.

215172220975920 is a `hidden beast` number, since 2 + 1 + 5 + 1 + 7 + 22 + 20 + 9 + 7 + 592 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (215172220975913) and next prime (215172220975927).

It is not an unprimeable number, because it can be changed into a prime (215172220975927) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2781725245 + ... + 2781802595.

Almost surely, 2^{215172220975920} is an apocalyptic number.

215172220975920 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 215172220975920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (401701901432832).

215172220975920 is an abundant number, since it is smaller than the sum of its proper divisors (588231581889744).

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

215172220975920 is a wasteful number, since it uses less digits than its factorization.

215172220975920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87001 (or 86992 counting only the distinct ones).

The product of its (nonzero) digits is 3175200, while the sum is 54.

The spelling of 215172220975920 in words is "two hundred fifteen trillion, one hundred seventy-two billion, two hundred twenty million, nine hundred seventy-five thousand, nine hundred twenty".