21113266 has 16 divisors (see below), whose sum is σ = 32155200. Its totient is φ = 10396368.

The previous prime is 21113251. The next prime is 21113297. The reversal of 21113266 is 66231112.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47875 + ... + 48313.

It is an arithmetic number, because the mean of its divisors is an integer number (2009700).

Almost surely, 2^21113266 is an apocalyptic number.

21113266 is a deficient number, since it is larger than the sum of its proper divisors (11041934).

21113266 is a wasteful number, since it uses less digits than its factorization.

21113266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753.

The product of its digits is 432, while the sum is 22.

The square root of 21113266 is about 4594.9174094863. The cubic root of 21113266 is about 276.3875480535.

Adding to 21113266 its reverse (66231112), we get a palindrome (87344378).

The spelling of 21113266 in words is "twenty-one million, one hundred thirteen thousand, two hundred sixty-six".