15243421 has 4 divisors (see below), whose sum is σ = 15251392. Its totient is φ = 15235452.

The previous prime is 15243409. The next prime is 15243439. The reversal of 15243421 is 12434251.

15243421 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 a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12434251 = 1663 ⋅7477.

It is a cyclic number.

It is not a de Polignac number, because 15243421 - 2¹⁵ = 15210653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 15243392 and 15243401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15243401) 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, 796 + ... + 5578.

It is an arithmetic number, because the mean of its divisors is an integer number (3812848).

Almost surely, 2^15243421 is an apocalyptic number.

It is an amenable number.

15243421 is a deficient number, since it is larger than the sum of its proper divisors (7971).

15243421 is an equidigital number, since it uses as much as digits as its factorization.

15243421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7970.

The product of its digits is 960, while the sum is 22.

The square root of 15243421 is about 3904.2823924506. The cubic root of 15243421 is about 247.9481171816.

Adding to 15243421 its reverse (12434251), we get a palindrome (27677672).

The spelling of 15243421 in words is "fifteen million, two hundred forty-three thousand, four hundred twenty-one".