321400431 has 12 divisors (see below), whose sum is σ = 506449320. Its totient is φ = 194788080.

The previous prime is 321400423. The next prime is 321400439. The reversal of 321400431 is 134004123.

It is an interprime number because it is at equal distance from previous prime (321400423) and next prime (321400439).

It is not a de Polignac number, because 321400431 - 2³ = 321400423 is a prime.

It is a super-2 number, since 2×321400431² = 206596474093971522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321400439) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1623136 + ... + 1623333.

It is an arithmetic number, because the mean of its divisors is an integer number (42204110).

Almost surely, 2^321400431 is an apocalyptic number.

321400431 is a deficient number, since it is larger than the sum of its proper divisors (185048889).

321400431 is a wasteful number, since it uses less digits than its factorization.

321400431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3246486 (or 3246483 counting only the distinct ones).

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

The square root of 321400431 is about 17927.6443237811. The cubic root of 321400431 is about 684.9867196885.

Adding to 321400431 its reverse (134004123), we get a palindrome (455404554).

The spelling of 321400431 in words is "three hundred twenty-one million, four hundred thousand, four hundred thirty-one".