2123312281 has 2 divisors, whose sum is σ = 2123312282. Its totient is φ = 2123312280.

The previous prime is 2123312221. The next prime is 2123312329. The reversal of 2123312281 is 1822133212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1966035600 + 157276681 = 44340^2 + 12541^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123312281 - 2¹⁷ = 2123181209 is a prime.

It is a super-2 number, since 2×2123312281² = 9016910085290845922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2123312221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061656140 + 1061656141.

It is an arithmetic number, because the mean of its divisors is an integer number (1061656141).

Almost surely, 2^2123312281 is an apocalyptic number.

It is an amenable number.

2123312281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123312281 is an equidigital number, since it uses as much as digits as its factorization.

2123312281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 25.

The square root of 2123312281 is about 46079.4127675256. The cubic root of 2123312281 is about 1285.3003443355.

Adding to 2123312281 its reverse (1822133212), we get a palindrome (3945445493).

The spelling of 2123312281 in words is "two billion, one hundred twenty-three million, three hundred twelve thousand, two hundred eighty-one".