21110266 has 16 divisors (see below), whose sum is σ = 32221800. Its totient is φ = 10371328.

The previous prime is 21110263. The next prime is 21110363. The reversal of 21110266 is 66201112.

It can be written as a sum of positive squares in 4 ways, for example, as 15374241 + 5736025 = 3921^2 + 2395^2 .

It is not an unprimeable number, because it can be changed into a prime (21110261) 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 7 ways as a sum of consecutive naturals, for example, 41220 + ... + 41728.

Almost surely, 2^21110266 is an apocalyptic number.

21110266 is a deficient number, since it is larger than the sum of its proper divisors (11111534).

21110266 is a wasteful number, since it uses less digits than its factorization.

21110266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 21110266 is about 4594.5909502370. The cubic root of 21110266 is about 276.3744567279.

Adding to 21110266 its reverse (66201112), we get a palindrome (87311378).

The spelling of 21110266 in words is "twenty-one million, one hundred ten thousand, two hundred sixty-six".