2311122220321 has 4 divisors (see below), whose sum is σ = 2334004618644. Its totient is φ = 2288239822000.

The previous prime is 2311122220313. The next prime is 2311122220391. The reversal of 2311122220321 is 1230222211132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1279079569296 + 1032042651025 = 1130964^2 + 1015895^2 .

It is a cyclic number.

It is not a de Polignac number, because 2311122220321 - 2³ = 2311122220313 is a prime.

It is a super-2 number, since 2×2311122220321² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2311122220292 and 2311122220301.

It is not an unprimeable number, because it can be changed into a prime (2311122220391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11441199010 + ... + 11441199211.

It is an arithmetic number, because the mean of its divisors is an integer number (583501154661).

Almost surely, 2^{2311122220321} is an apocalyptic number.

It is an amenable number.

2311122220321 is a deficient number, since it is larger than the sum of its proper divisors (22882398323).

2311122220321 is a wasteful number, since it uses less digits than its factorization.

2311122220321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22882398322.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 2311122220321 its reverse (1230222211132), we get a palindrome (3541344431453).

The spelling of 2311122220321 in words is "two trillion, three hundred eleven billion, one hundred twenty-two million, two hundred twenty thousand, three hundred twenty-one".