21938325 has 24 divisors (see below), whose sum is σ = 36777408. Its totient is φ = 11537280.

The previous prime is 21938269. The next prime is 21938327. The reversal of 21938325 is 52383912.

It is not a de Polignac number, because 21938325 - 2⁷ = 21938197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21938327) 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 23 ways as a sum of consecutive naturals, for example, 3472 + ... + 7478.

It is an arithmetic number, because the mean of its divisors is an integer number (1532392).

Almost surely, 2^21938325 is an apocalyptic number.

21938325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21938325 is a deficient number, since it is larger than the sum of its proper divisors (14839083).

21938325 is a wasteful number, since it uses less digits than its factorization.

21938325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4093 (or 4088 counting only the distinct ones).

The product of its digits is 12960, while the sum is 33.

The square root of 21938325 is about 4683.8365684554. The cubic root of 21938325 is about 279.9418459158.

The spelling of 21938325 in words is "twenty-one million, nine hundred thirty-eight thousand, three hundred twenty-five".