15224504221 has 4 divisors (see below), whose sum is σ = 15228787932. Its totient is φ = 15220220512.

The previous prime is 15224504213. The next prime is 15224504231. The reversal of 15224504221 is 12240542251.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8170352100 + 7054152121 = 90390^2 + 83989^2 .

It is a cyclic number.

It is not a de Polignac number, because 15224504221 - 2³ = 15224504213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15224504221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15224504231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2136520 + ... + 2143633.

It is an arithmetic number, because the mean of its divisors is an integer number (3807196983).

Almost surely, 2^15224504221 is an apocalyptic number.

It is an amenable number.

15224504221 is a deficient number, since it is larger than the sum of its proper divisors (4283711).

15224504221 is an equidigital number, since it uses as much as digits as its factorization.

15224504221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4283710.

The product of its (nonzero) digits is 6400, while the sum is 28.

The spelling of 15224504221 in words is "fifteen billion, two hundred twenty-four million, five hundred four thousand, two hundred twenty-one".