21133130233 has 2 divisors, whose sum is σ = 21133130234. Its totient is φ = 21133130232.

The previous prime is 21133130231. The next prime is 21133130329. The reversal of 21133130233 is 33203133112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18006419344 + 3126710889 = 134188^2 + 55917^2 .

It is a cyclic number.

It is not a de Polignac number, because 21133130233 - 2¹ = 21133130231 is a prime.

Together with 21133130231, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21133130231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566565116 + 10566565117.

It is an arithmetic number, because the mean of its divisors is an integer number (10566565117).

Almost surely, 2^21133130233 is an apocalyptic number.

It is an amenable number.

21133130233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21133130233 is an equidigital number, since it uses as much as digits as its factorization.

21133130233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 21133130233 its reverse (33203133112), we get a palindrome (54336263345).

The spelling of 21133130233 in words is "twenty-one billion, one hundred thirty-three million, one hundred thirty thousand, two hundred thirty-three".