21830833 has 4 divisors (see below), whose sum is σ = 21847540. Its totient is φ = 21814128.

The previous prime is 21830803. The next prime is 21830843. The reversal of 21830833 is 33803812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1607824 + 20223009 = 1268^2 + 4497^2 .

It is a cyclic number.

It is not a de Polignac number, because 21830833 - 2⁵ = 21830801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21830803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6210 + ... + 9067.

It is an arithmetic number, because the mean of its divisors is an integer number (5461885).

Almost surely, 2^21830833 is an apocalyptic number.

It is an amenable number.

21830833 is a deficient number, since it is larger than the sum of its proper divisors (16707).

21830833 is a wasteful number, since it uses less digits than its factorization.

21830833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16706.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 21830833 is about 4672.3476968222. The cubic root of 21830833 is about 279.4838834242.

The spelling of 21830833 in words is "twenty-one million, eight hundred thirty thousand, eight hundred thirty-three".