21925225 has 12 divisors (see below), whose sum is σ = 31071424. Its totient is φ = 15034320.

The previous prime is 21925219. The next prime is 21925229. The reversal of 21925225 is 52252912.

It is not a de Polignac number, because 21925225 - 2⁷ = 21925097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21925193 and 21925202.

It is not an unprimeable number, because it can be changed into a prime (21925229) 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 11 ways as a sum of consecutive naturals, for example, 62469 + ... + 62818.

Almost surely, 2^21925225 is an apocalyptic number.

21925225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21925225 is a deficient number, since it is larger than the sum of its proper divisors (9146199).

21925225 is a wasteful number, since it uses less digits than its factorization.

21925225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125304 (or 125299 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 21925225 is about 4682.4379333847. The cubic root of 21925225 is about 279.8861143994.

The spelling of 21925225 in words is "twenty-one million, nine hundred twenty-five thousand, two hundred twenty-five".