1321313031231 has 4 divisors (see below), whose sum is σ = 1761750708312. Its totient is φ = 880875354152.

The previous prime is 1321313031211. The next prime is 1321313031253. The reversal of 1321313031231 is 1321303131231.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321313031231 is a prime.

It is a super-2 number, since 2×1321313031231² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321313031211) 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, 220218838536 + ... + 220218838541.

It is an arithmetic number, because the mean of its divisors is an integer number (440437677078).

Almost surely, 2^{1321313031231} is an apocalyptic number.

1321313031231 is a deficient number, since it is larger than the sum of its proper divisors (440437677081).

1321313031231 is an equidigital number, since it uses as much as digits as its factorization.

1321313031231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440437677080.

The product of its (nonzero) digits is 972, while the sum is 24.

Adding to 1321313031231 its reverse (1321303131231), we get a palindrome (2642616162462).

The spelling of 1321313031231 in words is "one trillion, three hundred twenty-one billion, three hundred thirteen million, thirty-one thousand, two hundred thirty-one".