212407218 has 32 divisors (see below), whose sum is σ = 476611200. Its totient is φ = 70113168.

The previous prime is 212407207. The next prime is 212407243. The reversal of 212407218 is 812704212.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 212407191 and 212407200.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 13533 + ... + 24656.

It is an arithmetic number, because the mean of its divisors is an integer number (14894100).

Almost surely, 2^212407218 is an apocalyptic number.

212407218 is an abundant number, since it is smaller than the sum of its proper divisors (264203982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212407218 is a wasteful number, since it uses less digits than its factorization.

212407218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38303 (or 38297 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 212407218 is about 14574.1969933166. The cubic root of 212407218 is about 596.6547333145.

The spelling of 212407218 in words is "two hundred twelve million, four hundred seven thousand, two hundred eighteen".