221604634 has 8 divisors (see below), whose sum is σ = 332470260. Its totient is φ = 110781216.

The previous prime is 221604623. The next prime is 221604653. The reversal of 221604634 is 436406122.

It can be written as a sum of positive squares in 2 ways, for example, as 218892025 + 2712609 = 14795^2 + 1647^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×221604634² = 98217227620547912, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14022 + ... + 25294.

Almost surely, 2^221604634 is an apocalyptic number.

221604634 is a deficient number, since it is larger than the sum of its proper divisors (110865626).

221604634 is a wasteful number, since it uses less digits than its factorization.

221604634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21104.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 221604634 is about 14886.3908990729. The cubic root of 221604634 is about 605.1452275270.

The spelling of 221604634 in words is "two hundred twenty-one million, six hundred four thousand, six hundred thirty-four".