221385604 has 24 divisors (see below), whose sum is σ = 431641728. Its totient is φ = 98487840.

The previous prime is 221385583. The next prime is 221385613. The reversal of 221385604 is 406583122.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51459 + ... + 55594.

It is an arithmetic number, because the mean of its divisors is an integer number (17985072).

Almost surely, 2^221385604 is an apocalyptic number.

It is an amenable number.

221385604 is a deficient number, since it is larger than the sum of its proper divisors (210256124).

221385604 is a wasteful number, since it uses less digits than its factorization.

221385604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107115 (or 107113 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 221385604 is about 14879.0323610106. The cubic root of 221385604 is about 604.9457902843.

The spelling of 221385604 in words is "two hundred twenty-one million, three hundred eighty-five thousand, six hundred four".