21267225 has 72 divisors (see below), whose sum is σ = 45517920. Its totient is φ = 9707040.

The previous prime is 21267161. The next prime is 21267227. The reversal of 21267225 is 52276212.

It is not a de Polignac number, because 21267225 - 2⁶ = 21267161 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21267227) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 32754 + ... + 33396.

Almost surely, 2^21267225 is an apocalyptic number.

21267225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21267225 is an abundant number, since it is smaller than the sum of its proper divisors (24250695).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21267225 is a wasteful number, since it uses less digits than its factorization.

21267225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676 (or 658 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 21267225 is about 4611.6401637595. The cubic root of 21267225 is about 277.0577323223.

The spelling of 21267225 in words is "twenty-one million, two hundred sixty-seven thousand, two hundred twenty-five".