217342215188 has 36 divisors (see below), whose sum is σ = 454404685140. Its totient is φ = 90629183232.

The previous prime is 217342215157. The next prime is 217342215239. The reversal of 217342215188 is 881512243712.

It can be written as a sum of positive squares in 2 ways, for example, as 94665751684 + 122676463504 = 307678^2 + 350252^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14977733 + ... + 14992236.

It is an arithmetic number, because the mean of its divisors is an integer number (12622352365).

Almost surely, 2^217342215188 is an apocalyptic number.

217342215188 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

217342215188 is an abundant number, since it is smaller than the sum of its proper divisors (237062469952).

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

217342215188 is a wasteful number, since it uses less digits than its factorization.

217342215188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29970024 (or 29970015 counting only the distinct ones).

The product of its digits is 215040, while the sum is 44.

The spelling of 217342215188 in words is "two hundred seventeen billion, three hundred forty-two million, two hundred fifteen thousand, one hundred eighty-eight".