21735325 has 6 divisors (see below), whose sum is σ = 26951834. Its totient is φ = 17388240.

The previous prime is 21735283. The next prime is 21735331. The reversal of 21735325 is 52353712.

It can be written as a sum of positive squares in 3 ways, for example, as 10404 + 21724921 = 102^2 + 4661^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21735325 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21735293 and 21735302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 434682 + ... + 434731.

Almost surely, 2^21735325 is an apocalyptic number.

21735325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21735325 is a deficient number, since it is larger than the sum of its proper divisors (5216509).

21735325 is an equidigital number, since it uses as much as digits as its factorization.

21735325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869423 (or 869418 counting only the distinct ones).

The product of its digits is 6300, while the sum is 28.

The square root of 21735325 is about 4662.1159359244. The cubic root of 21735325 is about 279.0757150312.

The spelling of 21735325 in words is "twenty-one million, seven hundred thirty-five thousand, three hundred twenty-five".