12103131311021 has 2 divisors, whose sum is σ = 12103131311022. Its totient is φ = 12103131311020.

The previous prime is 12103131310969. The next prime is 12103131311023. The reversal of 12103131311021 is 12011313130121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8906941802500 + 3196189508521 = 2984450^2 + 1787789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12103131311021 is a prime.

Together with 12103131311023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12103131310984 and 12103131311002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12103131311023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6051565655510 + 6051565655511.

It is an arithmetic number, because the mean of its divisors is an integer number (6051565655511).

Almost surely, 2^{12103131311021} is an apocalyptic number.

It is an amenable number.

12103131311021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12103131311021 is an equidigital number, since it uses as much as digits as its factorization.

12103131311021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 12103131311021 its reverse (12011313130121), we get a palindrome (24114444441142).

The spelling of 12103131311021 in words is "twelve trillion, one hundred three billion, one hundred thirty-one million, three hundred eleven thousand, twenty-one".