221101221111212 has 48 divisors (see below), whose sum is σ = 417753959196000. Its totient is φ = 101786395875840.

The previous prime is 221101221111179. The next prime is 221101221111217. The reversal of 221101221111212 is 212111122101122.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (221101221111217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201306914 + ... + 202402262.

It is an arithmetic number, because the mean of its divisors is an integer number (8703207483250).

Almost surely, 2^{221101221111212} is an apocalyptic number.

It is an amenable number.

221101221111212 is a deficient number, since it is larger than the sum of its proper divisors (196652738084788).

221101221111212 is a wasteful number, since it uses less digits than its factorization.

221101221111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105266 (or 1105264 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 221101221111212 its reverse (212111122101122), we get a palindrome (433212343212334).

The spelling of 221101221111212 in words is "two hundred twenty-one trillion, one hundred one billion, two hundred twenty-one million, one hundred eleven thousand, two hundred twelve".