211112081 has 2 divisors, whose sum is σ = 211112082. Its totient is φ = 211112080.

The previous prime is 211112071. The next prime is 211112113. The reversal of 211112081 is 180211112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166823056 + 44289025 = 12916^2 + 6655^2 .

It is a cyclic number.

It is not a de Polignac number, because 211112081 - 2¹⁴ = 211095697 is a prime.

It is a super-2 number, since 2×211112081² = 89136621488301122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211112071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105556040 + 105556041.

It is an arithmetic number, because the mean of its divisors is an integer number (105556041).

Almost surely, 2^211112081 is an apocalyptic number.

It is an amenable number.

211112081 is a deficient number, since it is larger than the sum of its proper divisors (1).

211112081 is an equidigital number, since it uses as much as digits as its factorization.

211112081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

The square root of 211112081 is about 14529.6965212629. The cubic root of 211112081 is about 595.4395744248.

Adding to 211112081 its reverse (180211112), we get a palindrome (391323193).

The spelling of 211112081 in words is "two hundred eleven million, one hundred twelve thousand, eighty-one".