21333225 has 24 divisors (see below), whose sum is σ = 35856832. Its totient is φ = 11188800.

The previous prime is 21333199. The next prime is 21333251. The reversal of 21333225 is 52233312.

It is an interprime number because it is at equal distance from previous prime (21333199) and next prime (21333251).

It is not a de Polignac number, because 21333225 - 2⁷ = 21333097 is a prime.

It is a Duffinian number.

It is a Curzon 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 23 ways as a sum of consecutive naturals, for example, 2244 + ... + 6906.

Almost surely, 2^21333225 is an apocalyptic number.

21333225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21333225 is a deficient number, since it is larger than the sum of its proper divisors (14523607).

21333225 is a wasteful number, since it uses less digits than its factorization.

21333225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4737 (or 4732 counting only the distinct ones).

The product of its digits is 1080, while the sum is 21.

The square root of 21333225 is about 4618.7904260748. The cubic root of 21333225 is about 277.3440402761.

Adding to 21333225 its reverse (52233312), we get a palindrome (73566537).

The spelling of 21333225 in words is "twenty-one million, three hundred thirty-three thousand, two hundred twenty-five".