21268225 has 12 divisors (see below), whose sum is σ = 28770480. Its totient is φ = 15467600.

The previous prime is 21268213. The next prime is 21268231. The reversal of 21268225 is 52286212.

It is not a de Polignac number, because 21268225 - 2⁵ = 21268193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21268193 and 21268202.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38395 + ... + 38944.

It is an arithmetic number, because the mean of its divisors is an integer number (2397540).

Almost surely, 2^21268225 is an apocalyptic number.

21268225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21268225 is a deficient number, since it is larger than the sum of its proper divisors (7502255).

21268225 is a wasteful number, since it uses less digits than its factorization.

21268225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77360 (or 77355 counting only the distinct ones).

The product of its digits is 3840, while the sum is 28.

The square root of 21268225 is about 4611.7485837803. The cubic root of 21268225 is about 277.0620747379.

The spelling of 21268225 in words is "twenty-one million, two hundred sixty-eight thousand, two hundred twenty-five".