321221404 has 24 divisors (see below), whose sum is σ = 670376448. Its totient is φ = 131680560.

The previous prime is 321221401. The next prime is 321221413. The reversal of 321221404 is 404122123.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321221401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248752 + ... + 250039.

It is an arithmetic number, because the mean of its divisors is an integer number (27932352).

Almost surely, 2^321221404 is an apocalyptic number.

It is an amenable number.

321221404 is an abundant number, since it is smaller than the sum of its proper divisors (349155044).

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

321221404 is a wasteful number, since it uses less digits than its factorization.

321221404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498825 (or 498823 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 321221404 is about 17922.6505852232. The cubic root of 321221404 is about 684.8595119210.

Adding to 321221404 its reverse (404122123), we get a palindrome (725343527).

The spelling of 321221404 in words is "three hundred twenty-one million, two hundred twenty-one thousand, four hundred four".