15042015221 has 2 divisors, whose sum is σ = 15042015222. Its totient is φ = 15042015220.

The previous prime is 15042015139. The next prime is 15042015253. The reversal of 15042015221 is 12251024051.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8535172996 + 6506842225 = 92386^2 + 80665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15042015221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15042015271) 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, 7521007610 + 7521007611.

It is an arithmetic number, because the mean of its divisors is an integer number (7521007611).

Almost surely, 2^15042015221 is an apocalyptic number.

It is an amenable number.

15042015221 is a deficient number, since it is larger than the sum of its proper divisors (1).

15042015221 is an equidigital number, since it uses as much as digits as its factorization.

15042015221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 800, while the sum is 23.

Adding to 15042015221 its reverse (12251024051), we get a palindrome (27293039272).

The spelling of 15042015221 in words is "fifteen billion, forty-two million, fifteen thousand, two hundred twenty-one".