21245325 has 48 divisors (see below), whose sum is σ = 39193920. Its totient is φ = 10091520.

The previous prime is 21245317. The next prime is 21245347. The reversal of 21245325 is 52354212.

It is not a de Polignac number, because 21245325 - 2³ = 21245317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21245295 and 21245304.

It is a congruent number.

It is an unprimeable number.

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, 23787 + ... + 24663.

It is an arithmetic number, because the mean of its divisors is an integer number (816540).

Almost surely, 2^21245325 is an apocalyptic number.

21245325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21245325 is a deficient number, since it is larger than the sum of its proper divisors (17948595).

21245325 is a wasteful number, since it uses less digits than its factorization.

21245325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 926 (or 921 counting only the distinct ones).

The product of its digits is 2400, while the sum is 24.

The square root of 21245325 is about 4609.2651258091. The cubic root of 21245325 is about 276.9625992677.

Adding to 21245325 its reverse (52354212), we get a palindrome (73599537).

The spelling of 21245325 in words is "twenty-one million, two hundred forty-five thousand, three hundred twenty-five".