15122424221 has 2 divisors, whose sum is σ = 15122424222. Its totient is φ = 15122424220.

The previous prime is 15122424211. The next prime is 15122424271. The reversal of 15122424221 is 12242422151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12726321721 + 2396102500 = 112811^2 + 48950^2 .

It is a cyclic number.

It is not a de Polignac number, because 15122424221 - 2¹⁴ = 15122407837 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 (15122424211) 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, 7561212110 + 7561212111.

It is an arithmetic number, because the mean of its divisors is an integer number (7561212111).

Almost surely, 2^15122424221 is an apocalyptic number.

It is an amenable number.

15122424221 is a deficient number, since it is larger than the sum of its proper divisors (1).

15122424221 is an equidigital number, since it uses as much as digits as its factorization.

15122424221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2560, while the sum is 26.

Adding to 15122424221 its reverse (12242422151), we get a palindrome (27364846372).

The spelling of 15122424221 in words is "fifteen billion, one hundred twenty-two million, four hundred twenty-four thousand, two hundred twenty-one".