21800325 has 12 divisors (see below), whose sum is σ = 36043328. Its totient is φ = 11626800.

The previous prime is 21800321. The next prime is 21800329. The reversal of 21800325 is 52300812.

It is an interprime number because it is at equal distance from previous prime (21800321) and next prime (21800329).

It is not a de Polignac number, because 21800325 - 2² = 21800321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21800321) 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 11 ways as a sum of consecutive naturals, for example, 145261 + ... + 145410.

Almost surely, 2^21800325 is an apocalyptic number.

21800325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21800325 is a deficient number, since it is larger than the sum of its proper divisors (14243003).

21800325 is a wasteful number, since it uses less digits than its factorization.

21800325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290684 (or 290679 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 21800325 is about 4669.0818155179. The cubic root of 21800325 is about 279.3536323362.

The spelling of 21800325 in words is "twenty-one million, eight hundred thousand, three hundred twenty-five".