15238221 has 4 divisors (see below), whose sum is σ = 20317632. Its totient is φ = 10158812.

The previous prime is 15238193. The next prime is 15238229. The reversal of 15238221 is 12283251.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 15238221 - 2¹⁰ = 15237197 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 15238191 and 15238200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15238229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2539701 + ... + 2539706.

It is an arithmetic number, because the mean of its divisors is an integer number (5079408).

Almost surely, 2^15238221 is an apocalyptic number.

It is an amenable number.

15238221 is a deficient number, since it is larger than the sum of its proper divisors (5079411).

15238221 is an equidigital number, since it uses as much as digits as its factorization.

15238221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5079410.

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

The square root of 15238221 is about 3903.6164002115. The cubic root of 15238221 is about 247.9199197307.

The spelling of 15238221 in words is "fifteen million, two hundred thirty-eight thousand, two hundred twenty-one".