15321242 has 4 divisors (see below), whose sum is σ = 22981866. Its totient is φ = 7660620.

The previous prime is 15321221. The next prime is 15321253. The reversal of 15321242 is 24212351.

15321242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24212351 = 149 ⋅162499.

It can be written as a sum of positive squares in only one way, i.e., 15062161 + 259081 = 3881^2 + 509^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3830309 + ... + 3830312.

Almost surely, 2^15321242 is an apocalyptic number.

15321242 is a deficient number, since it is larger than the sum of its proper divisors (7660624).

15321242 is an equidigital number, since it uses as much as digits as its factorization.

15321242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7660623.

The product of its digits is 480, while the sum is 20.

The square root of 15321242 is about 3914.2358130292. The cubic root of 15321242 is about 248.3693443066.

Adding to 15321242 its reverse (24212351), we get a palindrome (39533593).

The spelling of 15321242 in words is "fifteen million, three hundred twenty-one thousand, two hundred forty-two".