201221201212 has 12 divisors (see below), whose sum is σ = 352177421400. Its totient is φ = 100599080816.

The previous prime is 201221201119. The next prime is 201221201213. The reversal of 201221201212 is 212102122102.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221201213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2840587 + ... + 2910562.

It is an arithmetic number, because the mean of its divisors is an integer number (29348118450).

Almost surely, 2^201221201212 is an apocalyptic number.

It is an amenable number.

201221201212 is a deficient number, since it is larger than the sum of its proper divisors (150956220188).

201221201212 is a wasteful number, since it uses less digits than its factorization.

201221201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5759900 (or 5759898 counting only the distinct ones).

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

Adding to 201221201212 its reverse (212102122102), we get a palindrome (413323323314).

The spelling of 201221201212 in words is "two hundred one billion, two hundred twenty-one million, two hundred one thousand, two hundred twelve".