221210212012 has 6 divisors (see below), whose sum is σ = 387117871028. Its totient is φ = 110605106004.

The previous prime is 221210212007. The next prime is 221210212031. The reversal of 221210212012 is 210212012122.

It is a happy number.

221210212012 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27651276498 + ... + 27651276505.

Almost surely, 2^221210212012 is an apocalyptic number.

It is an amenable number.

221210212012 is a deficient number, since it is larger than the sum of its proper divisors (165907659016).

221210212012 is a wasteful number, since it uses less digits than its factorization.

221210212012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55302553007 (or 55302553005 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221210212012 its reverse (210212012122), we get a palindrome (431422224134).

The spelling of 221210212012 in words is "two hundred twenty-one billion, two hundred ten million, two hundred twelve thousand, twelve".