212021121212 has 6 divisors (see below), whose sum is σ = 371036962128.
Its totient is φ = 106010560604.
The previous prime is 212021121199. The next prime is 212021121227. The reversal of 212021121212 is 212121120212.
212021121212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a congruent number.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26502640148 + ... + 26502640155.
It is an arithmetic number, because the mean of its divisors is an integer number (61839493688).
Almost surely, 2212021121212 is an apocalyptic number.
It is an amenable number.
212021121212 is a deficient number, since it is larger than the sum of its proper divisors (159015840916).
212021121212 is a wasteful number, since it uses less digits than its factorization.
212021121212 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 53005280307 (or 53005280305 counting only the distinct ones).
The product of its (nonzero) digits is 64, while the sum is 17.
Adding to 212021121212 its reverse (212121120212), we get a palindrome (424142241424).
The spelling of 212021121212 in words is "two hundred twelve billion, twenty-one million, one hundred twenty-one thousand, two hundred twelve".