21833040 has 40 divisors (see below), whose sum is σ = 67683168. Its totient is φ = 5822080.

The previous prime is 21833039. The next prime is 21833041. The reversal of 21833040 is 4033812.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21833039) and next prime (21833041).

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 21832998 and 21833016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21833041) 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, 45246 + ... + 45725.

Almost surely, 2^21833040 is an apocalyptic number.

21833040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21833040 is an abundant number, since it is smaller than the sum of its proper divisors (45850128).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21833040 is a wasteful number, since it uses less digits than its factorization.

21833040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90987 (or 90981 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21833040 is about 4672.5838676261. The cubic root of 21833040 is about 279.4933012989.

Adding to 21833040 its reverse (4033812), we get a palindrome (25866852).

The spelling of 21833040 in words is "twenty-one million, eight hundred thirty-three thousand, forty".