21433225 has 24 divisors (see below), whose sum is σ = 29507040. Its totient is φ = 15312000.

The previous prime is 21433219. The next prime is 21433231. The reversal of 21433225 is 52233412.

It is an interprime number because it is at equal distance from previous prime (21433219) and next prime (21433231).

It is a de Polignac number, because none of the positive numbers 2^k-21433225 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21433196 and 21433205.

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, 15565 + ... + 16885.

It is an arithmetic number, because the mean of its divisors is an integer number (1229460).

Almost surely, 2^21433225 is an apocalyptic number.

21433225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21433225 is a deficient number, since it is larger than the sum of its proper divisors (8073815).

21433225 is a wasteful number, since it uses less digits than its factorization.

21433225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1401 (or 1396 counting only the distinct ones).

The product of its digits is 1440, while the sum is 22.

The square root of 21433225 is about 4629.6031147389. The cubic root of 21433225 is about 277.7767171811.

Adding to 21433225 its reverse (52233412), we get a palindrome (73666637).

The spelling of 21433225 in words is "twenty-one million, four hundred thirty-three thousand, two hundred twenty-five".