21326225 has 6 divisors (see below), whose sum is σ = 26444550. Its totient is φ = 17060960.

The previous prime is 21326219. The next prime is 21326231. The reversal of 21326225 is 52262312.

It is an interprime number because it is at equal distance from previous prime (21326219) and next prime (21326231).

It can be written as a sum of positive squares in 3 ways, for example, as 18769 + 21307456 = 137^2 + 4616^2 .

It is not a de Polignac number, because 21326225 - 2⁶ = 21326161 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21326225.

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 5 ways as a sum of consecutive naturals, for example, 426500 + ... + 426549.

It is an arithmetic number, because the mean of its divisors is an integer number (4407425).

Almost surely, 2^21326225 is an apocalyptic number.

21326225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21326225 is a deficient number, since it is larger than the sum of its proper divisors (5118325).

21326225 is an equidigital number, since it uses as much as digits as its factorization.

21326225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853059 (or 853054 counting only the distinct ones).

The product of its digits is 1440, while the sum is 23.

The square root of 21326225 is about 4618.0325897507. The cubic root of 21326225 is about 277.3137022992.

Adding to 21326225 its reverse (52262312), we get a palindrome (73588537).

The spelling of 21326225 in words is "twenty-one million, three hundred twenty-six thousand, two hundred twenty-five".