15532340221 has 2 divisors, whose sum is σ = 15532340222. Its totient is φ = 15532340220.

The previous prime is 15532340209. The next prime is 15532340227. The reversal of 15532340221 is 12204323551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10113319225 + 5419020996 = 100565^2 + 73614^2 .

It is a cyclic number.

It is not a de Polignac number, because 15532340221 - 2⁵ = 15532340189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15532340221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15532340227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7766170110 + 7766170111.

It is an arithmetic number, because the mean of its divisors is an integer number (7766170111).

Almost surely, 2^15532340221 is an apocalyptic number.

It is an amenable number.

15532340221 is a deficient number, since it is larger than the sum of its proper divisors (1).

15532340221 is an equidigital number, since it uses as much as digits as its factorization.

15532340221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 15532340221 its reverse (12204323551), we get a palindrome (27736663772).

The spelling of 15532340221 in words is "fifteen billion, five hundred thirty-two million, three hundred forty thousand, two hundred twenty-one".