21267208 has 32 divisors (see below), whose sum is σ = 41679000. Its totient is φ = 10172736.

The previous prime is 21267161. The next prime is 21267227. The reversal of 21267208 is 80276212.

It can be written as a sum of positive squares in 4 ways, for example, as 13527684 + 7739524 = 3678^2 + 2782^2 .

It is a super-2 number, since 2×21267208² = 904588272230528, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195058 + ... + 195166.

Almost surely, 2^21267208 is an apocalyptic number.

It is an amenable number.

21267208 is a deficient number, since it is larger than the sum of its proper divisors (20411792).

21267208 is an equidigital number, since it uses as much as digits as its factorization.

21267208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202 (or 140 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 21267208 is about 4611.6383205971. The cubic root of 21267208 is about 277.0576585000.

The spelling of 21267208 in words is "twenty-one million, two hundred sixty-seven thousand, two hundred eight".