21833005 has 8 divisors (see below), whose sum is σ = 26391672. Its totient is φ = 17338368.

The previous prime is 21832991. The next prime is 21833017. The reversal of 21833005 is 50033812.

It can be written as a sum of positive squares in 4 ways, for example, as 1012036 + 20820969 = 1006^2 + 4563^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21833005 - 2⁵ = 21832973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15252 + ... + 16621.

It is an arithmetic number, because the mean of its divisors is an integer number (3298959).

Almost surely, 2^21833005 is an apocalyptic number.

It is an amenable number.

21833005 is a deficient number, since it is larger than the sum of its proper divisors (4558667).

21833005 is a wasteful number, since it uses less digits than its factorization.

21833005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32015.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 21833005 is about 4672.5801223735. The cubic root of 21833005 is about 279.4931519492.

Adding to 21833005 its reverse (50033812), we get a palindrome (71866817).

The spelling of 21833005 in words is "twenty-one million, eight hundred thirty-three thousand, five".