2122231981 has 2 divisors, whose sum is σ = 2122231982. Its totient is φ = 2122231980.

The previous prime is 2122231939. The next prime is 2122231997. The reversal of 2122231981 is 1891322212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1214174025 + 908057956 = 34845^2 + 30134^2 .

It is a cyclic number.

It is not a de Polignac number, because 2122231981 - 2¹⁷ = 2122100909 is a prime.

It is a super-2 number, since 2×2122231981² = 9007737162358368722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2122231481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061115990 + 1061115991.

It is an arithmetic number, because the mean of its divisors is an integer number (1061115991).

Almost surely, 2^2122231981 is an apocalyptic number.

It is an amenable number.

2122231981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2122231981 is an equidigital number, since it uses as much as digits as its factorization.

2122231981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 31.

The square root of 2122231981 is about 46067.6891215524. The cubic root of 2122231981 is about 1285.0823287499.

It can be divided in two parts, 2122231 and 981, that added together give a palindrome (2123212).

The spelling of 2122231981 in words is "two billion, one hundred twenty-two million, two hundred thirty-one thousand, nine hundred eighty-one".