2111321321 has 2 divisors, whose sum is σ = 2111321322. Its totient is φ = 2111321320.

The previous prime is 2111321297. The next prime is 2111321323. The reversal of 2111321321 is 1231231112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2098647721 + 12673600 = 45811^2 + 3560^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2111321321 is a prime.

Together with 2111321323, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2111321321.

It is not a weakly prime, because it can be changed into another prime (2111321323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055660660 + 1055660661.

It is an arithmetic number, because the mean of its divisors is an integer number (1055660661).

Almost surely, 2^2111321321 is an apocalyptic number.

It is an amenable number.

2111321321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111321321 is an equidigital number, since it uses as much as digits as its factorization.

2111321321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 17.

The square root of 2111321321 is about 45949.1166509216. The cubic root of 2111321321 is about 1282.8762875911.

Adding to 2111321321 its reverse (1231231112), we get a palindrome (3342552433).

The spelling of 2111321321 in words is "two billion, one hundred eleven million, three hundred twenty-one thousand, three hundred twenty-one".