21222112111211 has 24 divisors (see below), whose sum is σ = 23349002476800. Its totient is φ = 19274458896000.

The previous prime is 21222112111111. The next prime is 21222112111219. The reversal of 21222112111211 is 11211121122212.

It is a happy number.

It is not a de Polignac number, because 21222112111211 - 2³⁴ = 21204932242027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222112111219) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1427264885 + ... + 1427279753.

It is an arithmetic number, because the mean of its divisors is an integer number (972875103200).

Almost surely, 2^{21222112111211} is an apocalyptic number.

21222112111211 is a deficient number, since it is larger than the sum of its proper divisors (2126890365589).

21222112111211 is a wasteful number, since it uses less digits than its factorization.

21222112111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25331 (or 25320 counting only the distinct ones).

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

Adding to 21222112111211 its reverse (11211121122212), we get a palindrome (32433233233423).

The spelling of 21222112111211 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twelve million, one hundred eleven thousand, two hundred eleven".