15272421 has 4 divisors (see below), whose sum is σ = 20363232. Its totient is φ = 10181612.

The previous prime is 15272419. The next prime is 15272423. The reversal of 15272421 is 12427251.

15272421 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 an emirpimes, since its reverse is a distinct semiprime: 12427251 = 3 ⋅4142417.

It is an interprime number because it is at equal distance from previous prime (15272419) and next prime (15272423).

It is a cyclic number.

It is not a de Polignac number, because 15272421 - 2¹ = 15272419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15272391 and 15272400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15272423) 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, 2545401 + ... + 2545406.

It is an arithmetic number, because the mean of its divisors is an integer number (5090808).

Almost surely, 2^15272421 is an apocalyptic number.

It is an amenable number.

15272421 is a deficient number, since it is larger than the sum of its proper divisors (5090811).

15272421 is an equidigital number, since it uses as much as digits as its factorization.

15272421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5090810.

The product of its digits is 1120, while the sum is 24.

The square root of 15272421 is about 3907.9944984608. The cubic root of 15272421 is about 248.1052547064.

Adding to 15272421 its reverse (12427251), we get a palindrome (27699672).

The spelling of 15272421 in words is "fifteen million, two hundred seventy-two thousand, four hundred twenty-one".