15522534221 has 2 divisors, whose sum is σ = 15522534222. Its totient is φ = 15522534220.

The previous prime is 15522534211. The next prime is 15522534257. The reversal of 15522534221 is 12243522551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15220156900 + 302377321 = 123370^2 + 17389^2 .

It is a cyclic number.

It is not a de Polignac number, because 15522534221 - 2²² = 15518339917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15522534211) 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, 7761267110 + 7761267111.

It is an arithmetic number, because the mean of its divisors is an integer number (7761267111).

Almost surely, 2^15522534221 is an apocalyptic number.

It is an amenable number.

15522534221 is a deficient number, since it is larger than the sum of its proper divisors (1).

15522534221 is an equidigital number, since it uses as much as digits as its factorization.

15522534221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24000, while the sum is 32.

The spelling of 15522534221 in words is "fifteen billion, five hundred twenty-two million, five hundred thirty-four thousand, two hundred twenty-one".