221701404 has 24 divisors (see below), whose sum is σ = 535142160. Its totient is φ = 71352064.

The previous prime is 221701399. The next prime is 221701411. The reversal of 221701404 is 404107122.

It is a happy number.

It is a congruent number.

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, 318189 + ... + 318884.

It is an arithmetic number, because the mean of its divisors is an integer number (22297590).

Almost surely, 2^221701404 is an apocalyptic number.

It is an amenable number.

221701404 is an abundant number, since it is smaller than the sum of its proper divisors (313440756).

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

221701404 is a wasteful number, since it uses less digits than its factorization.

221701404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637109 (or 637107 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 221701404 is about 14889.6408284418. The cubic root of 221701404 is about 605.2332993643.

Adding to 221701404 its reverse (404107122), we get a palindrome (625808526).

The spelling of 221701404 in words is "two hundred twenty-one million, seven hundred one thousand, four hundred four".