21933983 has 4 divisors (see below), whose sum is σ = 21951840. Its totient is φ = 21916128.

The previous prime is 21933971. The next prime is 21934013. The reversal of 21933983 is 38933912.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21933983 - 2⁸ = 21933727 is a prime.

It is a super-2 number, since 2×21933983² = 962199220488578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21933683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6938 + ... + 9591.

It is an arithmetic number, because the mean of its divisors is an integer number (5487960).

Almost surely, 2^21933983 is an apocalyptic number.

21933983 is a deficient number, since it is larger than the sum of its proper divisors (17857).

21933983 is a wasteful number, since it uses less digits than its factorization.

21933983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17856.

The product of its digits is 34992, while the sum is 38.

The square root of 21933983 is about 4683.3730366051. The cubic root of 21933983 is about 279.9233761421.

The spelling of 21933983 in words is "twenty-one million, nine hundred thirty-three thousand, nine hundred eighty-three".