221212134212 has 24 divisors (see below), whose sum is σ = 400491990360. Its totient is φ = 106786265600.

The previous prime is 221212134203. The next prime is 221212134223. The reversal of 221212134212 is 212431212122.

It can be written as a sum of positive squares in 4 ways, for example, as 7559259136 + 213652875076 = 86944^2 + 462226^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2739212 + ... + 2818812.

It is an arithmetic number, because the mean of its divisors is an integer number (16687166265).

Almost surely, 2^221212134212 is an apocalyptic number.

It is an amenable number.

221212134212 is a deficient number, since it is larger than the sum of its proper divisors (179279856148).

221212134212 is a wasteful number, since it uses less digits than its factorization.

221212134212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103591 (or 103589 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

Adding to 221212134212 its reverse (212431212122), we get a palindrome (433643346334).

The spelling of 221212134212 in words is "two hundred twenty-one billion, two hundred twelve million, one hundred thirty-four thousand, two hundred twelve".