21222110121222 has 16 divisors (see below), whose sum is σ = 42444265389552. Its totient is φ = 7074029182560.

The previous prime is 21222110121161. The next prime is 21222110121259. The reversal of 21222110121222 is 22212101122212.

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, 10083948 + ... + 12005424.

It is an arithmetic number, because the mean of its divisors is an integer number (2652766586847).

Almost surely, 2^{21222110121222} is an apocalyptic number.

21222110121222 is an abundant number, since it is smaller than the sum of its proper divisors (21222155268330).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21222110121222 is a wasteful number, since it uses less digits than its factorization.

21222110121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3762263.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21222110121222 its reverse (22212101122212), we get a palindrome (43434211243434).

The spelling of 21222110121222 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred ten million, one hundred twenty-one thousand, two hundred twenty-two".