21433325 has 6 divisors (see below), whose sum is σ = 26577354. Its totient is φ = 17146640.

The previous prime is 21433319. The next prime is 21433351. The reversal of 21433325 is 52333412.

21433325 is nontrivially palindromic in base 13.

It can be written as a sum of positive squares in 3 ways, for example, as 218089 + 21215236 = 467^2 + 4606^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21433325 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21433325.

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, 428642 + ... + 428691.

It is an arithmetic number, because the mean of its divisors is an integer number (4429559).

Almost surely, 2^21433325 is an apocalyptic number.

21433325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21433325 is a deficient number, since it is larger than the sum of its proper divisors (5144029).

21433325 is an equidigital number, since it uses as much as digits as its factorization.

21433325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 857343 (or 857338 counting only the distinct ones).

The product of its digits is 2160, while the sum is 23.

The square root of 21433325 is about 4629.6139147881. The cubic root of 21433325 is about 277.7771491838. Note that the first 3 decimals are identical.

Adding to 21433325 its reverse (52333412), we get a palindrome (73766737).

The spelling of 21433325 in words is "twenty-one million, four hundred thirty-three thousand, three hundred twenty-five".