15241242221 has 2 divisors, whose sum is σ = 15241242222. Its totient is φ = 15241242220.

The previous prime is 15241242197. The next prime is 15241242227. The reversal of 15241242221 is 12224214251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12856384996 + 2384857225 = 113386^2 + 48835^2 .

It is a cyclic number.

It is not a de Polignac number, because 15241242221 - 2⁶ = 15241242157 is a prime.

It is a super-3 number, since 3×15241242221³ (a number of 32 digits) contains 333 as substring.

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 (15241242227) 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, 7620621110 + 7620621111.

It is an arithmetic number, because the mean of its divisors is an integer number (7620621111).

Almost surely, 2^15241242221 is an apocalyptic number.

It is an amenable number.

15241242221 is a deficient number, since it is larger than the sum of its proper divisors (1).

15241242221 is an equidigital number, since it uses as much as digits as its factorization.

15241242221 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 15241242221 its reverse (12224214251), we get a palindrome (27465456472).

The spelling of 15241242221 in words is "fifteen billion, two hundred forty-one million, two hundred forty-two thousand, two hundred twenty-one".