221220210212 has 12 divisors (see below), whose sum is σ = 387140906880. Its totient is φ = 110608522536.

The previous prime is 221220210209. The next prime is 221220210257. The reversal of 221220210212 is 212012022122.

It is a happy 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 in 3 ways as a sum of consecutive naturals, for example, 46988 + ... + 666819.

It is an arithmetic number, because the mean of its divisors is an integer number (32261742240).

Almost surely, 2^221220210212 is an apocalyptic number.

It is an amenable number.

221220210212 is a deficient number, since it is larger than the sum of its proper divisors (165920696668).

221220210212 is a wasteful number, since it uses less digits than its factorization.

221220210212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791290 (or 791288 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221220210212 its reverse (212012022122), we get a palindrome (433232232334).

The spelling of 221220210212 in words is "two hundred twenty-one billion, two hundred twenty million, two hundred ten thousand, two hundred twelve".