13121022031021 has 2 divisors, whose sum is σ = 13121022031022. Its totient is φ = 13121022031020.

The previous prime is 13121022031009. The next prime is 13121022031049. The reversal of 13121022031021 is 12013022012131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8113895280100 + 5007126750921 = 2848490^2 + 2237661^2 .

It is a cyclic number.

It is not a de Polignac number, because 13121022031021 - 2²¹ = 13121019933869 is a prime.

It is a super-2 number, since 2×13121022031021² (a number of 27 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 13121022031021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13121022037021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6560511015510 + 6560511015511.

It is an arithmetic number, because the mean of its divisors is an integer number (6560511015511).

Almost surely, 2^{13121022031021} is an apocalyptic number.

It is an amenable number.

13121022031021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13121022031021 is an equidigital number, since it uses as much as digits as its factorization.

13121022031021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 13121022031021 its reverse (12013022012131), we get a palindrome (25134044043152).

The spelling of 13121022031021 in words is "thirteen trillion, one hundred twenty-one billion, twenty-two million, thirty-one thousand, twenty-one".