1321312105031 has 2 divisors, whose sum is σ = 1321312105032. Its totient is φ = 1321312105030.

The previous prime is 1321312105019. The next prime is 1321312105067. The reversal of 1321312105031 is 1305012131231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321312105031 - 2⁶ = 1321312104967 is a prime.

It is a super-2 number, since 2×1321312105031² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1321312104988 and 1321312105006.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321312104031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660656052515 + 660656052516.

It is an arithmetic number, because the mean of its divisors is an integer number (660656052516).

Almost surely, 2^{1321312105031} is an apocalyptic number.

1321312105031 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321312105031 is an equidigital number, since it uses as much as digits as its factorization.

1321312105031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 23.

Adding to 1321312105031 its reverse (1305012131231), we get a palindrome (2626324236262).

The spelling of 1321312105031 in words is "one trillion, three hundred twenty-one billion, three hundred twelve million, one hundred five thousand, thirty-one".