221093904 has 40 divisors (see below), whose sum is σ = 571695552. Its totient is φ = 73628800.

The previous prime is 221093897. The next prime is 221093911. The reversal of 221093904 is 409390122.

It is an interprime number because it is at equal distance from previous prime (221093897) and next prime (221093911).

It is a super-2 number, since 2×221093904² = 97765028771922432, which contains 22 as substring.

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, 90037 + ... + 92459.

Almost surely, 2^221093904 is an apocalyptic number.

221093904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221093904 is an abundant number, since it is smaller than the sum of its proper divisors (350601648).

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

221093904 is a wasteful number, since it uses less digits than its factorization.

221093904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4335 (or 4329 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 221093904 is about 14869.2267451943. The cubic root of 221093904 is about 604.6799791932.

The spelling of 221093904 in words is "two hundred twenty-one million, ninety-three thousand, nine hundred four".