21230325 has 36 divisors (see below), whose sum is σ = 38331748. Its totient is φ = 11232000.

The previous prime is 21230309. The next prime is 21230329. The reversal of 21230325 is 52303212.

It can be written as a sum of positive squares in 6 ways, for example, as 79524 + 21150801 = 282^2 + 4599^2 .

It is not a de Polignac number, because 21230325 - 2⁴ = 21230309 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21230298 and 21230307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21230329) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 35025 + ... + 35625.

Almost surely, 2^21230325 is an apocalyptic number.

21230325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21230325 is a deficient number, since it is larger than the sum of its proper divisors (17101423).

21230325 is a wasteful number, since it uses less digits than its factorization.

21230325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774 (or 766 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 21230325 is about 4607.6376810682. The cubic root of 21230325 is about 276.8974019109.

Adding to 21230325 its reverse (52303212), we get a palindrome (73533537).

The spelling of 21230325 in words is "twenty-one million, two hundred thirty thousand, three hundred twenty-five".