21203330233 has 2 divisors, whose sum is σ = 21203330234. Its totient is φ = 21203330232.

The previous prime is 21203330221. The next prime is 21203330243. The reversal of 21203330233 is 33203330212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20998038649 + 205291584 = 144907^2 + 14328^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21203330233 is a prime.

It is not a weakly prime, because it can be changed into another prime (21203330243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601665116 + 10601665117.

It is an arithmetic number, because the mean of its divisors is an integer number (10601665117).

Almost surely, 2^21203330233 is an apocalyptic number.

It is an amenable number.

21203330233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203330233 is an equidigital number, since it uses as much as digits as its factorization.

21203330233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 22.

Adding to 21203330233 its reverse (33203330212), we get a palindrome (54406660445).

The spelling of 21203330233 in words is "twenty-one billion, two hundred three million, three hundred thirty thousand, two hundred thirty-three".