21893225 has 12 divisors (see below), whose sum is σ = 28577040. Its totient is φ = 16592400.

The previous prime is 21893219. The next prime is 21893227. The reversal of 21893225 is 52239812.

It is a happy number.

It is not a de Polignac number, because 21893225 - 2¹⁰ = 21892201 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21893191 and 21893200.

It is not an unprimeable number, because it can be changed into a prime (21893227) 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, 22571 + ... + 23520.

It is an arithmetic number, because the mean of its divisors is an integer number (2381420).

Almost surely, 2^21893225 is an apocalyptic number.

21893225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21893225 is a deficient number, since it is larger than the sum of its proper divisors (6683815).

21893225 is a wasteful number, since it uses less digits than its factorization.

21893225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46120 (or 46115 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 21893225 is about 4679.0196622797. The cubic root of 21893225 is about 279.7498829357.

The spelling of 21893225 in words is "twenty-one million, eight hundred ninety-three thousand, two hundred twenty-five".