221634628 has 12 divisors (see below), whose sum is σ = 389570832. Its totient is φ = 110328680.

The previous prime is 221634619. The next prime is 221634631. The reversal of 221634628 is 826436122.

It is a junction number, because it is equal to n+sod(n) for n = 221634593 and 221634602.

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, 121138 + ... + 122953.

It is an arithmetic number, because the mean of its divisors is an integer number (32464236).

Almost surely, 2^221634628 is an apocalyptic number.

It is an amenable number.

221634628 is a deficient number, since it is larger than the sum of its proper divisors (167936204).

221634628 is a wasteful number, since it uses less digits than its factorization.

221634628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244322 (or 244320 counting only the distinct ones).

The product of its digits is 27648, while the sum is 34.

The square root of 221634628 is about 14887.3982952026. The cubic root of 221634628 is about 605.1725282604.

The spelling of 221634628 in words is "two hundred twenty-one million, six hundred thirty-four thousand, six hundred twenty-eight".