21796925 has 12 divisors (see below), whose sum is σ = 27183156. Its totient is φ = 17337600.

The previous prime is 21796921. The next prime is 21796927. The reversal of 21796925 is 52969712.

It can be written as a sum of positive squares in 6 ways, for example, as 9504889 + 12292036 = 3083^2 + 3506^2 .

It is not a de Polignac number, because 21796925 - 2² = 21796921 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21796921) 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, 2117 + ... + 6933.

It is an arithmetic number, because the mean of its divisors is an integer number (2265263).

Almost surely, 2^21796925 is an apocalyptic number.

21796925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21796925 is a deficient number, since it is larger than the sum of its proper divisors (5386231).

21796925 is a wasteful number, since it uses less digits than its factorization.

21796925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5008 (or 5003 counting only the distinct ones).

The product of its digits is 68040, while the sum is 41.

The square root of 21796925 is about 4668.7177040382. The cubic root of 21796925 is about 279.3391088259.

The spelling of 21796925 in words is "twenty-one million, seven hundred ninety-six thousand, nine hundred twenty-five".