21125325 has 48 divisors (see below), whose sum is σ = 38497536. Its totient is φ = 10156800.

The previous prime is 21125303. The next prime is 21125327. The reversal of 21125325 is 52352112.

It is not a de Polignac number, because 21125325 - 2¹⁵ = 21092557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21125327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 45595 + ... + 46055.

It is an arithmetic number, because the mean of its divisors is an integer number (802032).

Almost surely, 2^21125325 is an apocalyptic number.

21125325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21125325 is a deficient number, since it is larger than the sum of its proper divisors (17372211).

21125325 is a wasteful number, since it uses less digits than its factorization.

21125325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534 (or 529 counting only the distinct ones).

The product of its digits is 600, while the sum is 21.

The square root of 21125325 is about 4596.2294329156. The cubic root of 21125325 is about 276.4401583112.

Adding to 21125325 its reverse (52352112), we get a palindrome (73477437).

The spelling of 21125325 in words is "twenty-one million, one hundred twenty-five thousand, three hundred twenty-five".