21982333 has 8 divisors (see below), whose sum is σ = 22503096. Its totient is φ = 21465600.

The previous prime is 21982313. The next prime is 21982339. The reversal of 21982333 is 33328912.

It can be written as a sum of positive squares in 4 ways, for example, as 10510564 + 11471769 = 3242^2 + 3387^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21982333 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21982295 and 21982304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21982339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11913 + ... + 13633.

It is an arithmetic number, because the mean of its divisors is an integer number (2812887).

Almost surely, 2^21982333 is an apocalyptic number.

It is an amenable number.

21982333 is a deficient number, since it is larger than the sum of its proper divisors (520763).

21982333 is a wasteful number, since it uses less digits than its factorization.

21982333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2015.

The product of its digits is 7776, while the sum is 31.

The square root of 21982333 is about 4688.5320730480. The cubic root of 21982333 is about 280.1289074807.

The spelling of 21982333 in words is "twenty-one million, nine hundred eighty-two thousand, three hundred thirty-three".