13362978221 has 2 divisors, whose sum is σ = 13362978222. Its totient is φ = 13362978220.

The previous prime is 13362978199. The next prime is 13362978241. The reversal of 13362978221 is 12287926331.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7577702500 + 5785275721 = 87050^2 + 76061^2 .

It is a cyclic number.

It is not a de Polignac number, because 13362978221 - 2⁶ = 13362978157 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 (13362978241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6681489110 + 6681489111.

It is an arithmetic number, because the mean of its divisors is an integer number (6681489111).

Almost surely, 2^13362978221 is an apocalyptic number.

It is an amenable number.

13362978221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13362978221 is an equidigital number, since it uses as much as digits as its factorization.

13362978221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 44.

The spelling of 13362978221 in words is "thirteen billion, three hundred sixty-two million, nine hundred seventy-eight thousand, two hundred twenty-one".