2112157181 has 2 divisors, whose sum is σ = 2112157182. Its totient is φ = 2112157180.

The previous prime is 2112157171. The next prime is 2112157207. The reversal of 2112157181 is 1817512112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2071069081 + 41088100 = 45509^2 + 6410^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112157181 - 2¹⁰ = 2112156157 is a prime.

It is a super-2 number, since 2×2112157181² = 8922415914499733522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2112157171) 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, 1056078590 + 1056078591.

It is an arithmetic number, because the mean of its divisors is an integer number (1056078591).

Almost surely, 2^2112157181 is an apocalyptic number.

It is an amenable number.

2112157181 is a deficient number, since it is larger than the sum of its proper divisors (1).

2112157181 is an equidigital number, since it uses as much as digits as its factorization.

2112157181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1120, while the sum is 29.

The square root of 2112157181 is about 45958.2112467402. The cubic root of 2112157181 is about 1283.0455597096.

Adding to 2112157181 its reverse (1817512112), we get a palindrome (3929669293).

The spelling of 2112157181 in words is "two billion, one hundred twelve million, one hundred fifty-seven thousand, one hundred eighty-one".