221111201212 has 24 divisors (see below), whose sum is σ = 422318724912. Its totient is φ = 100458105600.

The previous prime is 221111201203. The next prime is 221111201239. The reversal of 221111201212 is 212102111122.

It is a congruent number.

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, 1079373 + ... + 1267780.

It is an arithmetic number, because the mean of its divisors is an integer number (17596613538).

Almost surely, 2^221111201212 is an apocalyptic number.

221111201212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221111201212 is a deficient number, since it is larger than the sum of its proper divisors (201207523700).

221111201212 is a wasteful number, since it uses less digits than its factorization.

221111201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2349309 (or 2349307 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221111201212 its reverse (212102111122), we get a palindrome (433213312334).

The spelling of 221111201212 in words is "two hundred twenty-one billion, one hundred eleven million, two hundred one thousand, two hundred twelve".