21823983 has 6 divisors (see below), whose sum is σ = 31523544. Its totient is φ = 14549316.

The previous prime is 21823981. The next prime is 21824009. The reversal of 21823983 is 38932812.

It is a happy number.

It is not a de Polignac number, because 21823983 - 2¹ = 21823981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21823981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1212435 + ... + 1212452.

It is an arithmetic number, because the mean of its divisors is an integer number (5253924).

Almost surely, 2^21823983 is an apocalyptic number.

21823983 is a deficient number, since it is larger than the sum of its proper divisors (9699561).

21823983 is a wasteful number, since it uses less digits than its factorization.

21823983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2424893 (or 2424890 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 21823983 is about 4671.6146031110. The cubic root of 21823983 is about 279.4546485515.

The spelling of 21823983 in words is "twenty-one million, eight hundred twenty-three thousand, nine hundred eighty-three".