211122081 has 12 divisors (see below), whose sum is σ = 307654308. Its totient is φ = 139501824.

The previous prime is 211122071. The next prime is 211122097. The reversal of 211122081 is 180221112.

It can be written as a sum of positive squares in 2 ways, for example, as 81162081 + 129960000 = 9009^2 + 11400^2 .

It is not a de Polignac number, because 211122081 - 2¹¹ = 211120033 is a prime.

It is a super-2 number, since 2×211122081² = 89145066171541122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211122011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102780 + ... + 104813.

It is an arithmetic number, because the mean of its divisors is an integer number (25637859).

Almost surely, 2^211122081 is an apocalyptic number.

It is an amenable number.

211122081 is a deficient number, since it is larger than the sum of its proper divisors (96532227).

211122081 is a wasteful number, since it uses less digits than its factorization.

211122081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207712 (or 207709 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 211122081 is about 14530.0406399982. The cubic root of 211122081 is about 595.4489759107.

Adding to 211122081 its reverse (180221112), we get a palindrome (391343193).

The spelling of 211122081 in words is "two hundred eleven million, one hundred twenty-two thousand, eighty-one".