221890404 has 24 divisors (see below), whose sum is σ = 518082208. Its totient is φ = 73915200.

The previous prime is 221890391. The next prime is 221890421. The reversal of 221890404 is 404098122.

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, 16479 + ... + 26745.

Almost surely, 2^221890404 is an apocalyptic number.

It is an amenable number.

221890404 is an abundant number, since it is smaller than the sum of its proper divisors (296191804).

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

221890404 is a wasteful number, since it uses less digits than its factorization.

221890404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12075 (or 12073 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 221890404 is about 14895.9861707777. The cubic root of 221890404 is about 605.4052372372.

The spelling of 221890404 in words is "two hundred twenty-one million, eight hundred ninety thousand, four hundred four".