212112081 has 16 divisors (see below), whose sum is σ = 320928000. Its totient is φ = 138398544.

The previous prime is 212112073. The next prime is 212112091. The reversal of 212112081 is 180211212.

It is not a de Polignac number, because 212112081 - 2³ = 212112073 is a prime.

It is a super-2 number, since 2×212112081² = 89983069812301122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212112001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82306 + ... + 84843.

It is an arithmetic number, because the mean of its divisors is an integer number (20058000).

Almost surely, 2^212112081 is an apocalyptic number.

It is an amenable number.

212112081 is a deficient number, since it is larger than the sum of its proper divisors (108815919).

212112081 is a wasteful number, since it uses less digits than its factorization.

212112081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167205 (or 167199 counting only the distinct ones).

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

The square root of 212112081 is about 14564.0681473275. The cubic root of 212112081 is about 596.3782572870.

Adding to 212112081 its reverse (180211212), we get a palindrome (392323293).

The spelling of 212112081 in words is "two hundred twelve million, one hundred twelve thousand, eighty-one".