21833223 has 16 divisors (see below), whose sum is σ = 31105920. Its totient is φ = 13581216.

The previous prime is 21833209. The next prime is 21833237. The reversal of 21833223 is 32233812.

It is an interprime number because it is at equal distance from previous prime (21833209) and next prime (21833237).

It is not a de Polignac number, because 21833223 - 2¹² = 21829127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21833193 and 21833202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21833263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 961 + ... + 6677.

It is an arithmetic number, because the mean of its divisors is an integer number (1944120).

Almost surely, 2^21833223 is an apocalyptic number.

21833223 is a deficient number, since it is larger than the sum of its proper divisors (9272697).

21833223 is a wasteful number, since it uses less digits than its factorization.

21833223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5806.

The product of its digits is 1728, while the sum is 24.

The square root of 21833223 is about 4672.6034498981. The cubic root of 21833223 is about 279.4940821816.

The spelling of 21833223 in words is "twenty-one million, eight hundred thirty-three thousand, two hundred twenty-three".