13043251021 has 2 divisors, whose sum is σ = 13043251022. Its totient is φ = 13043251020.

The previous prime is 13043250971. The next prime is 13043251097. The reversal of 13043251021 is 12015234031.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12428905225 + 614345796 = 111485^2 + 24786^2 .

It is a cyclic number.

It is not a de Polignac number, because 13043251021 - 2²⁹ = 12506380109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13043250983 and 13043251001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13043551021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6521625510 + 6521625511.

It is an arithmetic number, because the mean of its divisors is an integer number (6521625511).

Almost surely, 2^13043251021 is an apocalyptic number.

It is an amenable number.

13043251021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13043251021 is an equidigital number, since it uses as much as digits as its factorization.

13043251021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 13043251021 its reverse (12015234031), we get a palindrome (25058485052).

The spelling of 13043251021 in words is "thirteen billion, forty-three million, two hundred fifty-one thousand, twenty-one".