212122018 has 16 divisors (see below), whose sum is σ = 324211896. Its totient is φ = 104070400.

The previous prime is 212122007. The next prime is 212122019. The reversal of 212122018 is 810221212.

It can be written as a sum of positive squares in 4 ways, for example, as 128527569 + 83594449 = 11337^2 + 9143^2 .

It is a junction number, because it is equal to n+sod(n) for n = 212121986 and 212122004.

It is not an unprimeable number, because it can be changed into a prime (212122019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18180 + ... + 27472.

Almost surely, 2^212122018 is an apocalyptic number.

212122018 is a deficient number, since it is larger than the sum of its proper divisors (112089878).

212122018 is a wasteful number, since it uses less digits than its factorization.

212122018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9509.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 212122018 is about 14564.4092911453. The cubic root of 212122018 is about 596.3875701594.

The spelling of 212122018 in words is "two hundred twelve million, one hundred twenty-two thousand, eighteen".