21200033 has 4 divisors (see below), whose sum is σ = 21210900. Its totient is φ = 21189168.

The previous prime is 21200021. The next prime is 21200041. The reversal of 21200033 is 33000212.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 20322064 + 877969 = 4508^2 + 937^2 .

It is a cyclic number.

It is not a de Polignac number, because 21200033 - 2¹⁶ = 21134497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21199987 and 21200023.

It is not an unprimeable number, because it can be changed into a prime (21200083) 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, 1610 + ... + 6707.

It is an arithmetic number, because the mean of its divisors is an integer number (5302725).

Almost surely, 2^21200033 is an apocalyptic number.

It is an amenable number.

21200033 is a deficient number, since it is larger than the sum of its proper divisors (10867).

21200033 is an equidigital number, since it uses as much as digits as its factorization.

21200033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10866.

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 21200033 is about 4604.3493568581. The cubic root of 21200033 is about 276.7656443336.

Adding to 21200033 its reverse (33000212), we get a palindrome (54200245).

The spelling of 21200033 in words is "twenty-one million, two hundred thousand, thirty-three".