15125421 has 16 divisors (see below), whose sum is σ = 21159936. Its totient is φ = 9592176.

The previous prime is 15125371. The next prime is 15125423. The reversal of 15125421 is 12452151.

It is not a de Polignac number, because 15125421 - 2¹⁰ = 15124397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15125423) 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, 14896 + ... + 15878.

It is an arithmetic number, because the mean of its divisors is an integer number (1322496).

Almost surely, 2^15125421 is an apocalyptic number.

It is an amenable number.

15125421 is a deficient number, since it is larger than the sum of its proper divisors (6034515).

15125421 is a wasteful number, since it uses less digits than its factorization.

15125421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1232.

The product of its digits is 400, while the sum is 21.

The square root of 15125421 is about 3889.1414219594. The cubic root of 15125421 is about 247.3066666897.

Adding to 15125421 its reverse (12452151), we get a palindrome (27577572).

The spelling of 15125421 in words is "fifteen million, one hundred twenty-five thousand, four hundred twenty-one".