21223683 has 12 divisors (see below), whose sum is σ = 33014800. Its totient is φ = 13060656.

The previous prime is 21223673. The next prime is 21223693. The reversal of 21223683 is 38632212.

It is an interprime number because it is at equal distance from previous prime (21223673) and next prime (21223693).

It is not a de Polignac number, because 21223683 - 2⁵ = 21223651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21223603) 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 11 ways as a sum of consecutive naturals, for example, 90583 + ... + 90816.

Almost surely, 2^21223683 is an apocalyptic number.

21223683 is a deficient number, since it is larger than the sum of its proper divisors (11791117).

21223683 is a wasteful number, since it uses less digits than its factorization.

21223683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181418 (or 181415 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 21223683 is about 4606.9168648891. The cubic root of 21223683 is about 276.8685227114.

Adding to 21223683 its reverse (38632212), we get a palindrome (59855895).

The spelling of 21223683 in words is "twenty-one million, two hundred twenty-three thousand, six hundred eighty-three".