5224131221 has 2 divisors, whose sum is σ = 5224131222. Its totient is φ = 5224131220.

The previous prime is 5224131173. The next prime is 5224131247. The reversal of 5224131221 is 1221314225.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4649330596 + 574800625 = 68186^2 + 23975^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5224131221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5224131421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2612065610 + 2612065611.

It is an arithmetic number, because the mean of its divisors is an integer number (2612065611).

Almost surely, 2^5224131221 is an apocalyptic number.

It is an amenable number.

5224131221 is a deficient number, since it is larger than the sum of its proper divisors (1).

5224131221 is an equidigital number, since it uses as much as digits as its factorization.

5224131221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 23.

The square root of 5224131221 is about 72278.1517541781. The cubic root of 5224131221 is about 1735.1539998455.

Adding to 5224131221 its reverse (1221314225), we get a palindrome (6445445446).

The spelling of 5224131221 in words is "five billion, two hundred twenty-four million, one hundred thirty-one thousand, two hundred twenty-one".