21433125 has 80 divisors (see below), whose sum is σ = 43186176. Its totient is φ = 9240000.

The previous prime is 21433123. The next prime is 21433127. The reversal of 21433125 is 52133412.

It is an interprime number because it is at equal distance from previous prime (21433123) and next prime (21433127).

It is not a de Polignac number, because 21433125 - 2¹ = 21433123 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433123) by changing a digit.

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 79 ways as a sum of consecutive naturals, for example, 301840 + ... + 301910.

Almost surely, 2^21433125 is an apocalyptic number.

21433125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21433125 is an abundant number, since it is smaller than the sum of its proper divisors (21753051).

21433125 is an equidigital number, since it uses as much as digits as its factorization.

21433125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124 (or 109 counting only the distinct ones).

The product of its digits is 720, while the sum is 21.

The square root of 21433125 is about 4629.5923146644. The cubic root of 21433125 is about 277.7762851772.

Adding to 21433125 its reverse (52133412), we get a palindrome (73566537).

The spelling of 21433125 in words is "twenty-one million, four hundred thirty-three thousand, one hundred twenty-five".