1321013022731 has 2 divisors, whose sum is σ = 1321013022732. Its totient is φ = 1321013022730.

The previous prime is 1321013022683. The next prime is 1321013022739. The reversal of 1321013022731 is 1372203101231.

It is a strong prime.

It is an emirp because it is prime and its reverse (1372203101231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321013022731 - 2²² = 1321008828427 is a prime.

It is a super-2 number, since 2×1321013022731² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1321013022731.

It is not a weakly prime, because it can be changed into another prime (1321013022739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660506511365 + 660506511366.

It is an arithmetic number, because the mean of its divisors is an integer number (660506511366).

Almost surely, 2^{1321013022731} is an apocalyptic number.

1321013022731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321013022731 is an equidigital number, since it uses as much as digits as its factorization.

1321013022731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 26.

Adding to 1321013022731 its reverse (1372203101231), we get a palindrome (2693216123962).

The spelling of 1321013022731 in words is "one trillion, three hundred twenty-one billion, thirteen million, twenty-two thousand, seven hundred thirty-one".