5221513421 has 2 divisors, whose sum is σ = 5221513422. Its totient is φ = 5221513420.

The previous prime is 5221513397. The next prime is 5221513447. The reversal of 5221513421 is 1243151225.

It is an a-pointer prime, because the next prime (5221513447) can be obtained adding 5221513421 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3182539396 + 2038974025 = 56414^2 + 45155^2 .

It is a cyclic number.

It is not a de Polignac number, because 5221513421 - 2⁶ = 5221513357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5221513021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2610756710 + 2610756711.

It is an arithmetic number, because the mean of its divisors is an integer number (2610756711).

Almost surely, 2^5221513421 is an apocalyptic number.

It is an amenable number.

5221513421 is a deficient number, since it is larger than the sum of its proper divisors (1).

5221513421 is an equidigital number, since it uses as much as digits as its factorization.

5221513421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 26.

The square root of 5221513421 is about 72260.0402781510. The cubic root of 5221513421 is about 1734.8641242107.

Adding to 5221513421 its reverse (1243151225), we get a palindrome (6464664646).

The spelling of 5221513421 in words is "five billion, two hundred twenty-one million, five hundred thirteen thousand, four hundred twenty-one".