215234885187 has 24 divisors (see below), whose sum is σ = 357149378144. Its totient is φ = 122354095104.

The previous prime is 215234885171. The next prime is 215234885189. The reversal of 215234885187 is 781588432512.

It is a happy number.

215234885187 is a `hidden beast` number, since 2 + 15 + 2 + 34 + 88 + 518 + 7 = 666.

It is not a de Polignac number, because 215234885187 - 2⁴ = 215234885171 is a prime.

It is a super-2 number, since 2×215234885187² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215234885189) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8838688 + ... + 8863005.

Almost surely, 2^215234885187 is an apocalyptic number.

215234885187 is a deficient number, since it is larger than the sum of its proper divisors (141914492957).

215234885187 is a wasteful number, since it uses less digits than its factorization.

215234885187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17701899 (or 17701896 counting only the distinct ones).

The product of its digits is 4300800, while the sum is 54.

The spelling of 215234885187 in words is "two hundred fifteen billion, two hundred thirty-four million, eight hundred eighty-five thousand, one hundred eighty-seven".