321402401 has 4 divisors (see below), whose sum is σ = 322653252. Its totient is φ = 320151552.

The previous prime is 321402383. The next prime is 321402421. The reversal of 321402401 is 104204123.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 224970001 + 96432400 = 14999^2 + 9820^2 .

It is a cyclic number.

It is not a de Polignac number, because 321402401 - 2¹⁴ = 321386017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 321402401.

It is not an unprimeable number, because it can be changed into a prime (321402421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 625040 + ... + 625553.

It is an arithmetic number, because the mean of its divisors is an integer number (80663313).

Almost surely, 2^321402401 is an apocalyptic number.

It is an amenable number.

321402401 is a deficient number, since it is larger than the sum of its proper divisors (1250851).

321402401 is a wasteful number, since it uses less digits than its factorization.

321402401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250850.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 321402401 is about 17927.6992667771. The cubic root of 321402401 is about 684.9881192107.

Adding to 321402401 its reverse (104204123), we get a palindrome (425606524).

The spelling of 321402401 in words is "three hundred twenty-one million, four hundred two thousand, four hundred one".