15228321 has 16 divisors (see below), whose sum is σ = 21008064. Its totient is φ = 9805824.

The previous prime is 15228319. The next prime is 15228337. The reversal of 15228321 is 12382251.

15228321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15228321 - 2¹ = 15228319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15228291 and 15228300.

It is not an unprimeable number, because it can be changed into a prime (15228361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11905 + ... + 13121.

It is an arithmetic number, because the mean of its divisors is an integer number (1313004).

Almost surely, 2^15228321 is an apocalyptic number.

It is an amenable number.

15228321 is a deficient number, since it is larger than the sum of its proper divisors (5779743).

15228321 is a wasteful number, since it uses less digits than its factorization.

15228321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360.

The product of its digits is 960, while the sum is 24.

The square root of 15228321 is about 3902.3481392618. The cubic root of 15228321 is about 247.8662183849.

The spelling of 15228321 in words is "fifteen million, two hundred twenty-eight thousand, three hundred twenty-one".