15352221121 has 4 divisors (see below), whose sum is σ = 15373339072. Its totient is φ = 15331103172.

The previous prime is 15352221107. The next prime is 15352221139. The reversal of 15352221121 is 12112225351.

It is a happy number.

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 15352221121 - 2³¹ = 13204737473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15352251121) 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, 10557885 + ... + 10559338.

It is an arithmetic number, because the mean of its divisors is an integer number (3843334768).

Almost surely, 2^15352221121 is an apocalyptic number.

It is an amenable number.

15352221121 is a deficient number, since it is larger than the sum of its proper divisors (21117951).

15352221121 is an equidigital number, since it uses as much as digits as its factorization.

15352221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21117950.

The product of its digits is 1200, while the sum is 25.

Adding to 15352221121 its reverse (12112225351), we get a palindrome (27464446472).

The spelling of 15352221121 in words is "fifteen billion, three hundred fifty-two million, two hundred twenty-one thousand, one hundred twenty-one".