2131221113233 has 2 divisors, whose sum is σ = 2131221113234. Its totient is φ = 2131221113232.

The previous prime is 2131221113183. The next prime is 2131221113261. The reversal of 2131221113233 is 3323111221312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2072885821504 + 58335291729 = 1439752^2 + 241527^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2131221113233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2131221113198 and 2131221113207.

It is not a weakly prime, because it can be changed into another prime (2131221813233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065610556616 + 1065610556617.

It is an arithmetic number, because the mean of its divisors is an integer number (1065610556617).

Almost surely, 2^{2131221113233} is an apocalyptic number.

It is an amenable number.

2131221113233 is a deficient number, since it is larger than the sum of its proper divisors (1).

2131221113233 is an equidigital number, since it uses as much as digits as its factorization.

2131221113233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 25.

Adding to 2131221113233 its reverse (3323111221312), we get a palindrome (5454332334545).

The spelling of 2131221113233 in words is "two trillion, one hundred thirty-one billion, two hundred twenty-one million, one hundred thirteen thousand, two hundred thirty-three".