221887835418 has 16 divisors (see below), whose sum is σ = 443801727360. Its totient is φ = 73958269056.

The previous prime is 221887835399. The next prime is 221887835431. The reversal of 221887835418 is 814538788122.

It is a happy number.

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, 974103 + ... + 1180106.

It is an arithmetic number, because the mean of its divisors is an integer number (27737607960).

Almost surely, 2^221887835418 is an apocalyptic number.

221887835418 is an abundant number, since it is smaller than the sum of its proper divisors (221913891942).

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

221887835418 is a wasteful number, since it uses less digits than its factorization.

221887835418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2171381.

The product of its digits is 6881280, while the sum is 57.

The spelling of 221887835418 in words is "two hundred twenty-one billion, eight hundred eighty-seven million, eight hundred thirty-five thousand, four hundred eighteen".