221094918 has 24 divisors (see below), whose sum is σ = 522588456. Its totient is φ = 66998400.

The previous prime is 221094917. The next prime is 221094941. The reversal of 221094918 is 819490122.

It is a super-3 number, since 3×221094918³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221094917) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 558123 + ... + 558518.

It is an arithmetic number, because the mean of its divisors is an integer number (21774519).

Almost surely, 2^221094918 is an apocalyptic number.

221094918 is an abundant number, since it is smaller than the sum of its proper divisors (301493538).

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

221094918 is a wasteful number, since it uses less digits than its factorization.

221094918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116660 (or 1116657 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 221094918 is about 14869.2608424225. The cubic root of 221094918 is about 604.6809036037.

The spelling of 221094918 in words is "two hundred twenty-one million, ninety-four thousand, nine hundred eighteen".