21268833 has 16 divisors (see below), whose sum is σ = 28902720. Its totient is φ = 13909824.

The previous prime is 21268829. The next prime is 21268837. The reversal of 21268833 is 33886212.

It is an interprime number because it is at equal distance from previous prime (21268829) and next prime (21268837).

It is not a de Polignac number, because 21268833 - 2² = 21268829 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21268794 and 21268803.

It is not an unprimeable number, because it can be changed into a prime (21268837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56835 + ... + 57207.

It is an arithmetic number, because the mean of its divisors is an integer number (1806420).

Almost surely, 2^21268833 is an apocalyptic number.

It is an amenable number.

21268833 is a deficient number, since it is larger than the sum of its proper divisors (7633887).

21268833 is a wasteful number, since it uses less digits than its factorization.

21268833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688.

The product of its digits is 13824, while the sum is 33.

The square root of 21268833 is about 4611.8145019070. The cubic root of 21268833 is about 277.0647148600.

The spelling of 21268833 in words is "twenty-one million, two hundred sixty-eight thousand, eight hundred thirty-three".