2172568218 has 16 divisors (see below), whose sum is σ = 4354819200. Its totient is φ = 722575616.

The previous prime is 2172568217. The next prime is 2172568259. The reversal of 2172568218 is 8128652712.

It is a self number, because there is not a number n which added to its sum of digits gives 2172568218.

It is not an unprimeable number, because it can be changed into a prime (2172568217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400530 + ... + 405917.

It is an arithmetic number, because the mean of its divisors is an integer number (272176200).

Almost surely, 2^2172568218 is an apocalyptic number.

2172568218 is an abundant number, since it is smaller than the sum of its proper divisors (2182250982).

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

2172568218 is a wasteful number, since it uses less digits than its factorization.

2172568218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806901.

The product of its digits is 107520, while the sum is 42.

The square root of 2172568218 is about 46610.8165343625. The cubic root of 2172568218 is about 1295.1631340430.

The spelling of 2172568218 in words is "two billion, one hundred seventy-two million, five hundred sixty-eight thousand, two hundred eighteen".