2121222001181 has 2 divisors, whose sum is σ = 2121222001182. Its totient is φ = 2121222001180.

The previous prime is 2121222001091. The next prime is 2121222001189. The reversal of 2121222001181 is 1811002221212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2091902288281 + 29319712900 = 1446341^2 + 171230^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121222001181 - 2²⁶ = 2121154892317 is a prime.

It is a super-2 number, since 2×2121222001181² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121222001189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060611000590 + 1060611000591.

It is an arithmetic number, because the mean of its divisors is an integer number (1060611000591).

Almost surely, 2^{2121222001181} is an apocalyptic number.

It is an amenable number.

2121222001181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121222001181 is an equidigital number, since it uses as much as digits as its factorization.

2121222001181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 23.

Adding to 2121222001181 its reverse (1811002221212), we get a palindrome (3932224222393).

The spelling of 2121222001181 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-two million, one thousand, one hundred eighty-one".