1321402331 has 4 divisors (see below), whose sum is σ = 1322660664. Its totient is φ = 1320144000.

The previous prime is 1321402319. The next prime is 1321402337. The reversal of 1321402331 is 1332041231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1332041231 = 6029 ⋅220939.

It is a cyclic number.

It is not a de Polignac number, because 1321402331 - 2¹⁰ = 1321401307 is a prime.

It is a super-2 number, since 2×1321402331² = 3492208240744467122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321402337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 627590 + ... + 629691.

It is an arithmetic number, because the mean of its divisors is an integer number (330665166).

Almost surely, 2^1321402331 is an apocalyptic number.

1321402331 is a deficient number, since it is larger than the sum of its proper divisors (1258333).

1321402331 is a wasteful number, since it uses less digits than its factorization.

1321402331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258332.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1321402331 is about 36351.0980714476. The cubic root of 1321402331 is about 1097.3496333206.

Adding to 1321402331 its reverse (1332041231), we get a palindrome (2653443562).

The spelling of 1321402331 in words is "one billion, three hundred twenty-one million, four hundred two thousand, three hundred thirty-one".