221894672 has 10 divisors (see below), whose sum is σ = 429920958. Its totient is φ = 110947328.

The previous prime is 221894633. The next prime is 221894681. The reversal of 221894672 is 276498122.

It can be written as a sum of positive squares in only one way, i.e., 144384256 + 77510416 = 12016^2 + 8804^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6934193 + ... + 6934224.

Almost surely, 2^221894672 is an apocalyptic number.

It is an amenable number.

221894672 is a deficient number, since it is larger than the sum of its proper divisors (208026286).

221894672 is a wasteful number, since it uses less digits than its factorization.

221894672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13868425 (or 13868419 counting only the distinct ones).

The product of its digits is 96768, while the sum is 41.

The square root of 221894672 is about 14896.1294301574. The cubic root of 221894672 is about 605.4091188125.

The spelling of 221894672 in words is "two hundred twenty-one million, eight hundred ninety-four thousand, six hundred seventy-two".