2311123001221 has 2 divisors, whose sum is σ = 2311123001222. Its totient is φ = 2311123001220.

The previous prime is 2311123001203. The next prime is 2311123001233. The reversal of 2311123001221 is 1221003211132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1262319660900 + 1048803340321 = 1123530^2 + 1024111^2 .

It is a cyclic number.

It is not a de Polignac number, because 2311123001221 - 2¹¹ = 2311122999173 is a prime.

It is a super-3 number, since 3×2311123001221³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2311123001261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1155561500610 + 1155561500611.

It is an arithmetic number, because the mean of its divisors is an integer number (1155561500611).

Almost surely, 2^{2311123001221} is an apocalyptic number.

It is an amenable number.

2311123001221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2311123001221 is an equidigital number, since it uses as much as digits as its factorization.

2311123001221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 2311123001221 its reverse (1221003211132), we get a palindrome (3532126212353).

The spelling of 2311123001221 in words is "two trillion, three hundred eleven billion, one hundred twenty-three million, one thousand, two hundred twenty-one".