13361249021 has 2 divisors, whose sum is σ = 13361249022. Its totient is φ = 13361249020.

The previous prime is 13361249017. The next prime is 13361249081. The reversal of 13361249021 is 12094216331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12336544900 + 1024704121 = 111070^2 + 32011^2 .

It is an emirp because it is prime and its reverse (12094216331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13361249021 - 2² = 13361249017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13361249081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6680624510 + 6680624511.

It is an arithmetic number, because the mean of its divisors is an integer number (6680624511).

Almost surely, 2^13361249021 is an apocalyptic number.

It is an amenable number.

13361249021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13361249021 is an equidigital number, since it uses as much as digits as its factorization.

13361249021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The spelling of 13361249021 in words is "thirteen billion, three hundred sixty-one million, two hundred forty-nine thousand, twenty-one".