2112120912221 has 2 divisors, whose sum is σ = 2112120912222. Its totient is φ = 2112120912220.

The previous prime is 2112120912199. The next prime is 2112120912233. The reversal of 2112120912221 is 1222190212112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2024274472900 + 87846439321 = 1422770^2 + 296389^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112120912221 - 2⁶ = 2112120912157 is a prime.

It is a super-2 number, since 2×2112120912221² (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 (2112120912721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1056060456110 + 1056060456111.

It is an arithmetic number, because the mean of its divisors is an integer number (1056060456111).

Almost surely, 2^{2112120912221} is an apocalyptic number.

It is an amenable number.

2112120912221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2112120912221 is an equidigital number, since it uses as much as digits as its factorization.

2112120912221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 2112120912221 in words is "two trillion, one hundred twelve billion, one hundred twenty million, nine hundred twelve thousand, two hundred twenty-one".