212220212 has 6 divisors (see below), whose sum is σ = 371385378.
Its totient is φ = 106110104.
The previous prime is 212220191. The next prime is 212220247. The reversal of 212220212 is 212022212.
It can be written as a sum of positive squares in only one way, i.e., 164968336 + 47251876 = 12844^2 + 6874^2
It is a congruent number.
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 as a sum of consecutive naturals, namely, 26527523 + ... + 26527530.
It is an arithmetic number, because the mean of its divisors is an integer number (61897563).
Almost surely, 2212220212 is an apocalyptic number.
It is an amenable number.
212220212 is a deficient number, since it is larger than the sum of its proper divisors (159165166).
212220212 is a wasteful number, since it uses less digits than its factorization.
212220212 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 53055057 (or 53055055 counting only the distinct ones).
The product of its (nonzero) digits is 64, while the sum is 14.
The square root of 212220212 is about 14567.7799269484.
The cubic root of 212220212 is about 596.4795811123.
Adding to 212220212 its reverse (212022212), we get a palindrome (424242424).
The spelling of 212220212 in words is "two hundred twelve million, two hundred twenty thousand, two hundred twelve".