21211301233 has 2 divisors, whose sum is σ = 21211301234. Its totient is φ = 21211301232.

The previous prime is 21211301231. The next prime is 21211301239. The reversal of 21211301233 is 33210311212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17341465969 + 3869835264 = 131687^2 + 62208^2 .

It is a cyclic number.

It is not a de Polignac number, because 21211301233 - 2¹ = 21211301231 is a prime.

Together with 21211301231, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21211301233.

It is not a weakly prime, because it can be changed into another prime (21211301231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605650616 + 10605650617.

It is an arithmetic number, because the mean of its divisors is an integer number (10605650617).

Almost surely, 2^21211301233 is an apocalyptic number.

It is an amenable number.

21211301233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211301233 is an equidigital number, since it uses as much as digits as its factorization.

21211301233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21211301233 its reverse (33210311212), we get a palindrome (54421612445).

The spelling of 21211301233 in words is "twenty-one billion, two hundred eleven million, three hundred one thousand, two hundred thirty-three".