21120211221233 has 2 divisors, whose sum is σ = 21120211221234. Its totient is φ = 21120211221232.

The previous prime is 21120211221199. The next prime is 21120211221283. The reversal of 21120211221233 is 33212211202112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20960345593009 + 159865628224 = 4578247^2 + 399832^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120211221233 - 2¹⁰ = 21120211220209 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21120211221199 and 21120211221208.

It is not a weakly prime, because it can be changed into another prime (21120211221283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560105610616 + 10560105610617.

It is an arithmetic number, because the mean of its divisors is an integer number (10560105610617).

Almost surely, 2^{21120211221233} is an apocalyptic number.

It is an amenable number.

21120211221233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120211221233 is an equidigital number, since it uses as much as digits as its factorization.

21120211221233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21120211221233 its reverse (33212211202112), we get a palindrome (54332422423345).

The spelling of 21120211221233 in words is "twenty-one trillion, one hundred twenty billion, two hundred eleven million, two hundred twenty-one thousand, two hundred thirty-three".