221011221212 has 12 divisors (see below), whose sum is σ = 386782916520. Its totient is φ = 110501816496.

The previous prime is 221011221209. The next prime is 221011221239. The reversal of 221011221212 is 212122110122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 815387 + ... + 1052082.

It is an arithmetic number, because the mean of its divisors is an integer number (32231909710).

Almost surely, 2^221011221212 is an apocalyptic number.

It is an amenable number.

221011221212 is a deficient number, since it is larger than the sum of its proper divisors (165771695308).

221011221212 is a wasteful number, since it uses less digits than its factorization.

221011221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1897060 (or 1897058 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221011221212 its reverse (212122110122), we get a palindrome (433133331334).

The spelling of 221011221212 in words is "two hundred twenty-one billion, eleven million, two hundred twenty-one thousand, two hundred twelve".