13251521021 has 2 divisors, whose sum is σ = 13251521022. Its totient is φ = 13251521020.

The previous prime is 13251520999. The next prime is 13251521033. The reversal of 13251521021 is 12012515231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13245708100 + 5812921 = 115090^2 + 2411^2 .

It is a cyclic number.

It is not a de Polignac number, because 13251521021 - 2¹⁸ = 13251258877 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13251521081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6625760510 + 6625760511.

It is an arithmetic number, because the mean of its divisors is an integer number (6625760511).

Almost surely, 2^13251521021 is an apocalyptic number.

It is an amenable number.

13251521021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13251521021 is an equidigital number, since it uses as much as digits as its factorization.

13251521021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 23.

It can be divided in two parts, 132515210 and 21, that added together give a palindrome (132515231).

The spelling of 13251521021 in words is "thirteen billion, two hundred fifty-one million, five hundred twenty-one thousand, twenty-one".