2168221212 has 36 divisors (see below), whose sum is σ = 5537293216. Its totient is φ = 715288320.

The previous prime is 2168221183. The next prime is 2168221229. The reversal of 2168221212 is 2121228612.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 306964 + ... + 313947.

Almost surely, 2^2168221212 is an apocalyptic number.

It is an amenable number.

2168221212 is an abundant number, since it is smaller than the sum of its proper divisors (3369072004).

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

2168221212 is a wasteful number, since it uses less digits than its factorization.

2168221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621018 (or 621013 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 2168221212 is about 46564.1623139513. The cubic root of 2168221212 is about 1294.2987436792.

Adding to 2168221212 its reverse (2121228612), we get a palindrome (4289449824).

The spelling of 2168221212 in words is "two billion, one hundred sixty-eight million, two hundred twenty-one thousand, two hundred twelve".