2217217185172 has 24 divisors (see below), whose sum is σ = 4239158781312. Its totient is φ = 1006328467200.

The previous prime is 2217217185167. The next prime is 2217217185223. The reversal of 2217217185172 is 2715817127122.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37408204 + ... + 37467427.

It is an arithmetic number, because the mean of its divisors is an integer number (176631615888).

Almost surely, 2^{2217217185172} is an apocalyptic number.

2217217185172 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2217217185172 is a deficient number, since it is larger than the sum of its proper divisors (2021941596140).

2217217185172 is a wasteful number, since it uses less digits than its factorization.

2217217185172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74876319 (or 74876317 counting only the distinct ones).

The product of its digits is 219520, while the sum is 46.

The spelling of 2217217185172 in words is "two trillion, two hundred seventeen billion, two hundred seventeen million, one hundred eighty-five thousand, one hundred seventy-two".