15421125 has 64 divisors (see below), whose sum is σ = 28304640. Its totient is φ = 7424000.

The previous prime is 15421121. The next prime is 15421139. The reversal of 15421125 is 52112451.

It is not a de Polignac number, because 15421125 - 2² = 15421121 is a prime.

It is a super-2 number, since 2×15421125² = 475622192531250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15421121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 261346 + ... + 261404.

It is an arithmetic number, because the mean of its divisors is an integer number (442260).

Almost surely, 2^15421125 is an apocalyptic number.

15421125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15421125 is a deficient number, since it is larger than the sum of its proper divisors (12883515).

15421125 is a wasteful number, since it uses less digits than its factorization.

15421125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 125 counting only the distinct ones).

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

The square root of 15421125 is about 3926.9740258881. The cubic root of 15421125 is about 248.9079029092.

Adding to 15421125 its reverse (52112451), we get a palindrome (67533576).

The spelling of 15421125 in words is "fifteen million, four hundred twenty-one thousand, one hundred twenty-five".