15375421 has 4 divisors (see below), whose sum is σ = 15408000. Its totient is φ = 15342844.

The previous prime is 15375401. The next prime is 15375449. The reversal of 15375421 is 12457351.

It is a happy number.

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: 12457351 = 379 ⋅32869.

It is a cyclic number.

It is not a de Polignac number, because 15375421 - 2¹³ = 15367229 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 15375421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15375401) 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, 15571 + ... + 16528.

It is an arithmetic number, because the mean of its divisors is an integer number (3852000).

Almost surely, 2^15375421 is an apocalyptic number.

It is an amenable number.

15375421 is a deficient number, since it is larger than the sum of its proper divisors (32579).

15375421 is an equidigital number, since it uses as much as digits as its factorization.

15375421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32578.

The product of its digits is 4200, while the sum is 28.

The square root of 15375421 is about 3921.1504689313. The cubic root of 15375421 is about 248.6617612502.

The spelling of 15375421 in words is "fifteen million, three hundred seventy-five thousand, four hundred twenty-one".