13361249221 has 2 divisors, whose sum is σ = 13361249222. Its totient is φ = 13361249220.

The previous prime is 13361249197. The next prime is 13361249233. The reversal of 13361249221 is 12294216331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11451996196 + 1909253025 = 107014^2 + 43695^2 .

It is a cyclic number.

It is not a de Polignac number, because 13361249221 - 2²⁵ = 13327694789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13361249021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6680624610 + 6680624611.

It is an arithmetic number, because the mean of its divisors is an integer number (6680624611).

Almost surely, 2^13361249221 is an apocalyptic number.

It is an amenable number.

13361249221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13361249221 is an equidigital number, since it uses as much as digits as its factorization.

13361249221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 34.

The spelling of 13361249221 in words is "thirteen billion, three hundred sixty-one million, two hundred forty-nine thousand, two hundred twenty-one".