21226267 has 4 divisors (see below), whose sum is σ = 21235720. Its totient is φ = 21216816.

The previous prime is 21226241. The next prime is 21226277. The reversal of 21226267 is 76262212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21226267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21226237) 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 3 ways as a sum of consecutive naturals, for example, 784 + ... + 6562.

It is an arithmetic number, because the mean of its divisors is an integer number (5308930).

Almost surely, 2^21226267 is an apocalyptic number.

21226267 is a deficient number, since it is larger than the sum of its proper divisors (9453).

21226267 is an equidigital number, since it uses as much as digits as its factorization.

21226267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9452.

The product of its digits is 4032, while the sum is 28.

The square root of 21226267 is about 4607.1973042187. The cubic root of 21226267 is about 276.8797585752.

Adding to 21226267 its reverse (76262212), we get a palindrome (97488479).

The spelling of 21226267 in words is "twenty-one million, two hundred twenty-six thousand, two hundred sixty-seven".