15021228 has 24 divisors (see below), whose sum is σ = 35309232. Its totient is φ = 4969984.

The previous prime is 15021197. The next prime is 15021239. The reversal of 15021228 is 82212051.

It is a happy number.

15021228 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2925 + ... + 6212.

It is an arithmetic number, because the mean of its divisors is an integer number (1471218).

Almost surely, 2^15021228 is an apocalyptic number.

It is an amenable number.

15021228 is an abundant number, since it is smaller than the sum of its proper divisors (20288004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15021228 is a wasteful number, since it uses less digits than its factorization.

15021228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9281 (or 9279 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 15021228 is about 3875.7229003116. The cubic root of 15021228 is about 246.7374920392.

Adding to 15021228 its reverse (82212051), we get a palindrome (97233279).

The spelling of 15021228 in words is "fifteen million, twenty-one thousand, two hundred twenty-eight".