218520993922 has 16 divisors (see below), whose sum is σ = 408662638272. Its totient is φ = 85138049520.

The previous prime is 218520993883. The next prime is 218520993947. The reversal of 218520993922 is 229399025812.

It is a self number, because there is not a number n which added to its sum of digits gives 218520993922.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 709483593 + ... + 709483900.

It is an arithmetic number, because the mean of its divisors is an integer number (25541414892).

Almost surely, 2^218520993922 is an apocalyptic number.

218520993922 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

218520993922 is a deficient number, since it is larger than the sum of its proper divisors (190141644350).

218520993922 is a wasteful number, since it uses less digits than its factorization.

218520993922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1418967513.

The product of its (nonzero) digits is 1399680, while the sum is 52.

The spelling of 218520993922 in words is "two hundred eighteen billion, five hundred twenty million, nine hundred ninety-three thousand, nine hundred twenty-two".