21233111213 has 2 divisors, whose sum is σ = 21233111214. Its totient is φ = 21233111212.

The previous prime is 21233111203. The next prime is 21233111269. The reversal of 21233111213 is 31211133212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19050072484 + 2183038729 = 138022^2 + 46723^2 .

It is a cyclic number.

It is not a de Polignac number, because 21233111213 - 2⁸ = 21233110957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21233111203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616555606 + 10616555607.

It is an arithmetic number, because the mean of its divisors is an integer number (10616555607).

Almost surely, 2^21233111213 is an apocalyptic number.

It is an amenable number.

21233111213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233111213 is an equidigital number, since it uses as much as digits as its factorization.

21233111213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 20.

Adding to 21233111213 its reverse (31211133212), we get a palindrome (52444244425).

The spelling of 21233111213 in words is "twenty-one billion, two hundred thirty-three million, one hundred eleven thousand, two hundred thirteen".