215521135200120 has 64 divisors (see below), whose sum is σ = 646564371156000. Its totient is φ = 57472216892928.

The previous prime is 215521135199989. The next prime is 215521135200143. The reversal of 215521135200120 is 21002531125512.

It is a super-2 number, since 2×215521135200120² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154348446 + ... + 155738514.

Almost surely, 2^{215521135200120} is an apocalyptic number.

215521135200120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215521135200120 is an abundant number, since it is smaller than the sum of its proper divisors (431043235955880).

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

215521135200120 is a wasteful number, since it uses less digits than its factorization.

215521135200120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2682112 (or 2682108 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 30.

Adding to 215521135200120 its reverse (21002531125512), we get a palindrome (236523666325632).

The spelling of 215521135200120 in words is "two hundred fifteen trillion, five hundred twenty-one billion, one hundred thirty-five million, two hundred thousand, one hundred twenty".