21133320233 has 4 divisors (see below), whose sum is σ = 21133612500. Its totient is φ = 21133027968.

The previous prime is 21133320227. The next prime is 21133320283. The reversal of 21133320233 is 33202333112.

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 4286059024 + 16847261209 = 65468^2 + 129797^2 .

It is a cyclic number.

It is not a de Polignac number, because 21133320233 - 2²² = 21129125929 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 = 21133320199 and 21133320208.

It is not an unprimeable number, because it can be changed into a prime (21133320283) 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, 50741 + ... + 211757.

It is an arithmetic number, because the mean of its divisors is an integer number (5283403125).

Almost surely, 2^21133320233 is an apocalyptic number.

It is an amenable number.

21133320233 is a deficient number, since it is larger than the sum of its proper divisors (292267).

21133320233 is a wasteful number, since it uses less digits than its factorization.

21133320233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292266.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 21133320233 its reverse (33202333112), we get a palindrome (54335653345).

The spelling of 21133320233 in words is "twenty-one billion, one hundred thirty-three million, three hundred twenty thousand, two hundred thirty-three".