321420404 has 24 divisors (see below), whose sum is σ = 576428160. Its totient is φ = 156750336.

The previous prime is 321420389. The next prime is 321420409. The reversal of 321420404 is 404024123.

It is a super-2 number, since 2×321420404² = 206622152215046432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321420409) 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, 54932 + ... + 60500.

It is an arithmetic number, because the mean of its divisors is an integer number (24017840).

Almost surely, 2^321420404 is an apocalyptic number.

It is an amenable number.

321420404 is a deficient number, since it is larger than the sum of its proper divisors (255007756).

321420404 is a wasteful number, since it uses less digits than its factorization.

321420404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5927 (or 5925 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 321420404 is about 17928.2013598688. The cubic root of 321420404 is about 685.0009085892. Note that the first 3 decimals are identical.

Adding to 321420404 its reverse (404024123), we get a palindrome (725444527).

The spelling of 321420404 in words is "three hundred twenty-one million, four hundred twenty thousand, four hundred four".