21338925 has 24 divisors (see below), whose sum is σ = 36500640. Its totient is φ = 10987200.

The previous prime is 21338873. The next prime is 21338929. The reversal of 21338925 is 52983312.

It is not a de Polignac number, because 21338925 - 2⁷ = 21338797 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21338929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2731 + ... + 7080.

It is an arithmetic number, because the mean of its divisors is an integer number (1520860).

Almost surely, 2^21338925 is an apocalyptic number.

21338925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21338925 is a deficient number, since it is larger than the sum of its proper divisors (15161715).

21338925 is a wasteful number, since it uses less digits than its factorization.

21338925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9853 (or 9848 counting only the distinct ones).

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

The square root of 21338925 is about 4619.4074295303. The cubic root of 21338925 is about 277.3687391555.

The spelling of 21338925 in words is "twenty-one million, three hundred thirty-eight thousand, nine hundred twenty-five".