21798333 has 6 divisors (see below), whose sum is σ = 31486494. Its totient is φ = 14532216.

The previous prime is 21798331. The next prime is 21798341. The reversal of 21798333 is 33389712.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 15657849 + 6140484 = 3957^2 + 2478^2 .

It is not a de Polignac number, because 21798333 - 2¹ = 21798331 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21798331) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1211010 + ... + 1211027.

It is an arithmetic number, because the mean of its divisors is an integer number (5247749).

Almost surely, 2^21798333 is an apocalyptic number.

It is an amenable number.

21798333 is a deficient number, since it is larger than the sum of its proper divisors (9688161).

21798333 is a wasteful number, since it uses less digits than its factorization.

21798333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2422043 (or 2422040 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 21798333 is about 4668.8684924722. The cubic root of 21798333 is about 279.3451234510.

The spelling of 21798333 in words is "twenty-one million, seven hundred ninety-eight thousand, three hundred thirty-three".