221404404 has 48 divisors (see below), whose sum is σ = 568205568. Its totient is φ = 66672768.

The previous prime is 221404399. The next prime is 221404427. The reversal of 221404404 is 404404122.

It is a super-2 number, since 2×221404404² = 98039820221190432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7767 + ... + 22430.

It is an arithmetic number, because the mean of its divisors is an integer number (11837616).

Almost surely, 2^221404404 is an apocalyptic number.

It is an amenable number.

221404404 is an abundant number, since it is smaller than the sum of its proper divisors (346801164).

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

221404404 is a wasteful number, since it uses less digits than its factorization.

221404404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30264 (or 30262 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 221404404 is about 14879.6641091121. The cubic root of 221404404 is about 604.9629137388.

Adding to 221404404 its reverse (404404122), we get a palindrome (625808526).

The spelling of 221404404 in words is "two hundred twenty-one million, four hundred four thousand, four hundred four".