212120018 has 12 divisors (see below), whose sum is σ = 349735470. Its totient is φ = 96418080.

The previous prime is 212120017. The next prime is 212120021. The reversal of 212120018 is 810021212.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 116920969 + 95199049 = 10813^2 + 9757^2 .

It is a junction number, because it is equal to n+sod(n) for n = 212119978 and 212120005.

It is not an unprimeable number, because it can be changed into a prime (212120017) 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 5 ways as a sum of consecutive naturals, for example, 438023 + ... + 438506.

Almost surely, 2^212120018 is an apocalyptic number.

212120018 is a deficient number, since it is larger than the sum of its proper divisors (137615452).

212120018 is a wasteful number, since it uses less digits than its factorization.

212120018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876553 (or 876542 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 212120018 is about 14564.3406304577. The cubic root of 212120018 is about 596.3856957997.

The spelling of 212120018 in words is "two hundred twelve million, one hundred twenty thousand, eighteen".