2221112112181 has 2 divisors, whose sum is σ = 2221112112182. Its totient is φ = 2221112112180.

The previous prime is 2221112112173. The next prime is 2221112112187. The reversal of 2221112112181 is 1812112111222.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1771984283281 + 449127828900 = 1331159^2 + 670170^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221112112181 - 2³ = 2221112112173 is a prime.

It is a super-2 number, since 2×2221112112181² (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 (2221112112187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110556056090 + 1110556056091.

It is an arithmetic number, because the mean of its divisors is an integer number (1110556056091).

Almost surely, 2^{2221112112181} is an apocalyptic number.

It is an amenable number.

2221112112181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221112112181 is an equidigital number, since it uses as much as digits as its factorization.

2221112112181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 256, while the sum is 25.

The spelling of 2221112112181 in words is "two trillion, two hundred twenty-one billion, one hundred twelve million, one hundred twelve thousand, one hundred eighty-one".