21075266 has 12 divisors (see below), whose sum is σ = 31959906. Its totient is φ = 10423200.

The previous prime is 21075253. The next prime is 21075283. The reversal of 21075266 is 66257012.

It can be written as a sum of positive squares in 3 ways, for example, as 16362025 + 4713241 = 4045^2 + 2171^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19886 + ... + 20918.

Almost surely, 2^21075266 is an apocalyptic number.

21075266 is a deficient number, since it is larger than the sum of its proper divisors (10884640).

21075266 is a wasteful number, since it uses less digits than its factorization.

21075266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237 (or 1136 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 21075266 is about 4590.7805436549. The cubic root of 21075266 is about 276.2216328713.

The spelling of 21075266 in words is "twenty-one million, seventy-five thousand, two hundred sixty-six".