21933925 has 12 divisors (see below), whose sum is σ = 29290660. Its totient is φ = 16197120.

The previous prime is 21933911. The next prime is 21933929. The reversal of 21933925 is 52933912.

It can be written as a sum of positive squares in 6 ways, for example, as 8749764 + 13184161 = 2958^2 + 3631^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21933925 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21933929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33420 + ... + 34069.

Almost surely, 2^21933925 is an apocalyptic number.

21933925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21933925 is a deficient number, since it is larger than the sum of its proper divisors (7356735).

21933925 is a wasteful number, since it uses less digits than its factorization.

21933925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67512 (or 67507 counting only the distinct ones).

The product of its digits is 14580, while the sum is 34.

The square root of 21933925 is about 4683.3668444827. The cubic root of 21933925 is about 279.9231294083.

The spelling of 21933925 in words is "twenty-one million, nine hundred thirty-three thousand, nine hundred twenty-five".