15131421 has 16 divisors (see below), whose sum is σ = 22638720. Its totient is φ = 9987840.

The previous prime is 15131387. The next prime is 15131437. The reversal of 15131421 is 12413151.

It is not a de Polignac number, because 15131421 - 2⁶ = 15131357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15131394 and 15131403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15131461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61 + ... + 5501.

It is an arithmetic number, because the mean of its divisors is an integer number (1414920).

Almost surely, 2^15131421 is an apocalyptic number.

It is an amenable number.

15131421 is a deficient number, since it is larger than the sum of its proper divisors (7507299).

15131421 is a wasteful number, since it uses less digits than its factorization.

15131421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5553 (or 5547 counting only the distinct ones).

The product of its digits is 120, while the sum is 18.

The square root of 15131421 is about 3889.9127239567. The cubic root of 15131421 is about 247.3393631645.

Adding to 15131421 its reverse (12413151), we get a palindrome (27544572).

The spelling of 15131421 in words is "fifteen million, one hundred thirty-one thousand, four hundred twenty-one".