5221521397 has 2 divisors, whose sum is σ = 5221521398. Its totient is φ = 5221521396.

The previous prime is 5221521317. The next prime is 5221521407. The reversal of 5221521397 is 7931251225.

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., 4833864676 + 387656721 = 69526^2 + 19689^2 .

It is a cyclic number.

It is not a de Polignac number, because 5221521397 - 2⁷ = 5221521269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5221521317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2610760698 + 2610760699.

It is an arithmetic number, because the mean of its divisors is an integer number (2610760699).

Almost surely, 2^5221521397 is an apocalyptic number.

It is an amenable number.

5221521397 is a deficient number, since it is larger than the sum of its proper divisors (1).

5221521397 is an equidigital number, since it uses as much as digits as its factorization.

5221521397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 37.

The square root of 5221521397 is about 72260.0954676923. The cubic root of 5221521397 is about 1734.8650075606.

The spelling of 5221521397 in words is "five billion, two hundred twenty-one million, five hundred twenty-one thousand, three hundred ninety-seven".