15221113 has 4 divisors (see below), whose sum is σ = 15230068. Its totient is φ = 15212160.

The previous prime is 15221099. The next prime is 15221149. The reversal of 15221113 is 31112251.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 31112251 = 31 ⋅1003621.

It can be written as a sum of positive squares in 2 ways, for example, as 4012009 + 11209104 = 2003^2 + 3348^2 .

It is a cyclic number.

It is not a de Polignac number, because 15221113 - 2¹³ = 15212921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15221153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1056 + ... + 5617.

It is an arithmetic number, because the mean of its divisors is an integer number (3807517).

Almost surely, 2^15221113 is an apocalyptic number.

It is an amenable number.

15221113 is a deficient number, since it is larger than the sum of its proper divisors (8955).

15221113 is an equidigital number, since it uses as much as digits as its factorization.

15221113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8954.

The product of its digits is 60, while the sum is 16.

The square root of 15221113 is about 3901.4244834419. The cubic root of 15221113 is about 247.8271048223.

Adding to 15221113 its reverse (31112251), we get a palindrome (46333364).

The spelling of 15221113 in words is "fifteen million, two hundred twenty-one thousand, one hundred thirteen".