2311111321 has 2 divisors, whose sum is σ = 2311111322. Its totient is φ = 2311111320.

The previous prime is 2311111259. The next prime is 2311111339. The reversal of 2311111321 is 1231111132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1944810000 + 366301321 = 44100^2 + 19139^2 .

It is a cyclic number.

It is not a de Polignac number, because 2311111321 - 2¹⁹ = 2310587033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2311111295 and 2311111304.

It is not a weakly prime, because it can be changed into another prime (2311111381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1155555660 + 1155555661.

It is an arithmetic number, because the mean of its divisors is an integer number (1155555661).

Almost surely, 2^2311111321 is an apocalyptic number.

It is an amenable number.

2311111321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2311111321 is an equidigital number, since it uses as much as digits as its factorization.

2311111321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 16.

The square root of 2311111321 is about 48074.0191891629. The cubic root of 2311111321 is about 1322.1283618112.

Adding to 2311111321 its reverse (1231111132), we get a palindrome (3542222453).

The spelling of 2311111321 in words is "two billion, three hundred eleven million, one hundred eleven thousand, three hundred twenty-one".