15532240121 has 2 divisors, whose sum is σ = 15532240122. Its totient is φ = 15532240120.

The previous prime is 15532240091. The next prime is 15532240201. The reversal of 15532240121 is 12104223551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10084176400 + 5448063721 = 100420^2 + 73811^2 .

It is a cyclic number.

It is not a de Polignac number, because 15532240121 - 2⁶ = 15532240057 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (15532240421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7766120060 + 7766120061.

It is an arithmetic number, because the mean of its divisors is an integer number (7766120061).

Almost surely, 2^15532240121 is an apocalyptic number.

It is an amenable number.

15532240121 is a deficient number, since it is larger than the sum of its proper divisors (1).

15532240121 is an equidigital number, since it uses as much as digits as its factorization.

15532240121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 15532240121 its reverse (12104223551), we get a palindrome (27636463672).

The spelling of 15532240121 in words is "fifteen billion, five hundred thirty-two million, two hundred forty thousand, one hundred twenty-one".