215205420217120 has 48 divisors (see below), whose sum is σ = 508516215883200. Its totient is φ = 86066352532224.

The previous prime is 215205420217079. The next prime is 215205420217147. The reversal of 215205420217120 is 21712024502512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122685420 + ... + 124427179.

It is an arithmetic number, because the mean of its divisors is an integer number (10594087830900).

Almost surely, 2^{215205420217120} is an apocalyptic number.

215205420217120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215205420217120 is an abundant number, since it is smaller than the sum of its proper divisors (293310795666080).

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

215205420217120 is a wasteful number, since it uses less digits than its factorization.

215205420217120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247118057 (or 247118049 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 34.

Adding to 215205420217120 its reverse (21712024502512), we get a palindrome (236917444719632).

The spelling of 215205420217120 in words is "two hundred fifteen trillion, two hundred five billion, four hundred twenty million, two hundred seventeen thousand, one hundred twenty".