221345404 has 12 divisors (see below), whose sum is σ = 442690864. Its totient is φ = 94862304.

The previous prime is 221345387. The next prime is 221345413. The reversal of 221345404 is 404543122.

It is a happy number.

221345404 is an admirable number.

It is a congruent number.

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, 3952569 + ... + 3952624.

Almost surely, 2^221345404 is an apocalyptic number.

It is an amenable number.

221345404 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221345404 is a wasteful number, since it uses less digits than its factorization.

221345404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7905204 (or 7905202 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 221345404 is about 14877.6814053803. The cubic root of 221345404 is about 604.9091719851.

Adding to 221345404 its reverse (404543122), we get a palindrome (625888526).

The spelling of 221345404 in words is "two hundred twenty-one million, three hundred forty-five thousand, four hundred four".