21230833 has 8 divisors (see below), whose sum is σ = 23079168. Its totient is φ = 19413264.

The previous prime is 21230827. The next prime is 21230843. The reversal of 21230833 is 33803212.

It is a happy number.

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

It is not a de Polignac number, because 21230833 - 2⁵ = 21230801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21230843) 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, 6241 + ... + 9022.

It is an arithmetic number, because the mean of its divisors is an integer number (2884896).

Almost surely, 2^21230833 is an apocalyptic number.

It is an amenable number.

21230833 is a deficient number, since it is larger than the sum of its proper divisors (1848335).

21230833 is a wasteful number, since it uses less digits than its factorization.

21230833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15383.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 21230833 is about 4607.6928066007. The cubic root of 21230833 is about 276.8996104304.

The spelling of 21230833 in words is "twenty-one million, two hundred thirty thousand, eight hundred thirty-three".