21233312263 has 2 divisors, whose sum is σ = 21233312264. Its totient is φ = 21233312262.

The previous prime is 21233312209. The next prime is 21233312299. The reversal of 21233312263 is 36221333212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21233312263 - 2³³ = 12643377671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21233312203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616656131 + 10616656132.

It is an arithmetic number, because the mean of its divisors is an integer number (10616656132).

Almost surely, 2^21233312263 is an apocalyptic number.

21233312263 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233312263 is an equidigital number, since it uses as much as digits as its factorization.

21233312263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 28.

Adding to 21233312263 its reverse (36221333212), we get a palindrome (57454645475).

The spelling of 21233312263 in words is "twenty-one billion, two hundred thirty-three million, three hundred twelve thousand, two hundred sixty-three".