321321402 has 12 divisors (see below), whose sum is σ = 696196410. Its totient is φ = 107107128.

The previous prime is 321321397. The next prime is 321321433. The reversal of 321321402 is 204123123.

It can be written as a sum of positive squares in only one way, i.e., 316163961 + 5157441 = 17781^2 + 2271^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 17851189 = 321321402 / (3 + 2 + 1 + 3 + 2 + 1 + 4 + 0 + 2).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8925577 + ... + 8925612.

Almost surely, 2^321321402 is an apocalyptic number.

321321402 is an abundant number, since it is smaller than the sum of its proper divisors (374875008).

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

321321402 is a wasteful number, since it uses less digits than its factorization.

321321402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17851197 (or 17851194 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 321321402 is about 17925.4400782798. The cubic root of 321321402 is about 684.9305713993.

Adding to 321321402 its reverse (204123123), we get a palindrome (525444525).

The spelling of 321321402 in words is "three hundred twenty-one million, three hundred twenty-one thousand, four hundred two".