13012312021 has 2 divisors, whose sum is σ = 13012312022. Its totient is φ = 13012312020.

The previous prime is 13012311979. The next prime is 13012312037. The reversal of 13012312021 is 12021321031.

It is an a-pointer prime, because the next prime (13012312037) can be obtained adding 13012312021 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7994148100 + 5018163921 = 89410^2 + 70839^2 .

It is a cyclic number.

It is not a de Polignac number, because 13012312021 - 2³³ = 4422377429 is a prime.

It is a super-2 number, since 2×13012312021² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13012311986 and 13012312004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13012312321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6506156010 + 6506156011.

It is an arithmetic number, because the mean of its divisors is an integer number (6506156011).

Almost surely, 2^13012312021 is an apocalyptic number.

It is an amenable number.

13012312021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13012312021 is an equidigital number, since it uses as much as digits as its factorization.

13012312021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 13012312021 its reverse (12021321031), we get a palindrome (25033633052).

The spelling of 13012312021 in words is "thirteen billion, twelve million, three hundred twelve thousand, twenty-one".