4221362521 has 2 divisors, whose sum is σ = 4221362522. Its totient is φ = 4221362520.

The previous prime is 4221362489. The next prime is 4221362539. The reversal of 4221362521 is 1252631224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3716731225 + 504631296 = 60965^2 + 22464^2 .

It is a cyclic number.

It is not a de Polignac number, because 4221362521 - 2⁵ = 4221362489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4221362521.

It is not a weakly prime, because it can be changed into another prime (4221363521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2110681260 + 2110681261.

It is an arithmetic number, because the mean of its divisors is an integer number (2110681261).

Almost surely, 2^4221362521 is an apocalyptic number.

It is an amenable number.

4221362521 is a deficient number, since it is larger than the sum of its proper divisors (1).

4221362521 is an equidigital number, since it uses as much as digits as its factorization.

4221362521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 28.

The square root of 4221362521 is about 64972.0133672953. The cubic root of 4221362521 is about 1616.1594897862.

Adding to 4221362521 its reverse (1252631224), we get a palindrome (5473993745).

The spelling of 4221362521 in words is "four billion, two hundred twenty-one million, three hundred sixty-two thousand, five hundred twenty-one".