15221065 has 4 divisors (see below), whose sum is σ = 18265284. Its totient is φ = 12176848.

The previous prime is 15221053. The next prime is 15221083. The reversal of 15221065 is 56012251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56012251 = 499 ⋅112249.

It can be written as a sum of positive squares in 2 ways, for example, as 3297856 + 11923209 = 1816^2 + 3453^2 .

It is a cyclic number.

It is not a de Polignac number, because 15221065 - 2¹⁷ = 15089993 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1522102 + ... + 1522111.

It is an arithmetic number, because the mean of its divisors is an integer number (4566321).

Almost surely, 2^15221065 is an apocalyptic number.

It is an amenable number.

15221065 is a deficient number, since it is larger than the sum of its proper divisors (3044219).

15221065 is an equidigital number, since it uses as much as digits as its factorization.

15221065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3044218.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 15221065 is about 3901.4183318378. The cubic root of 15221065 is about 247.8268443132.

The spelling of 15221065 in words is "fifteen million, two hundred twenty-one thousand, sixty-five".