15222222135321 has 4 divisors (see below), whose sum is σ = 20296296180432. Its totient is φ = 10148148090212.

The previous prime is 15222222135283. The next prime is 15222222135371. The reversal of 15222222135321 is 12353122222251.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15222222135321 - 2⁹ = 15222222134809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15222222135371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2537037022551 + ... + 2537037022556.

It is an arithmetic number, because the mean of its divisors is an integer number (5074074045108).

Almost surely, 2^{15222222135321} is an apocalyptic number.

It is an amenable number.

15222222135321 is a deficient number, since it is larger than the sum of its proper divisors (5074074045111).

15222222135321 is an equidigital number, since it uses as much as digits as its factorization.

15222222135321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5074074045110.

The product of its digits is 28800, while the sum is 33.

Adding to 15222222135321 its reverse (12353122222251), we get a palindrome (27575344357572).

The spelling of 15222222135321 in words is "fifteen trillion, two hundred twenty-two billion, two hundred twenty-two million, one hundred thirty-five thousand, three hundred twenty-one".