21222102111212 has 12 divisors (see below), whose sum is σ = 37143112163640. Its totient is φ = 10609784350176.

The previous prime is 21222102111143. The next prime is 21222102111229. The reversal of 21222102111212 is 21211120122212.

It is a super-2 number, since 2×21222102111212² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316638662 + ... + 316705677.

It is an arithmetic number, because the mean of its divisors is an integer number (3095259346970).

Almost surely, 2^{21222102111212} is an apocalyptic number.

It is an amenable number.

21222102111212 is a deficient number, since it is larger than the sum of its proper divisors (15921010052428).

21222102111212 is a wasteful number, since it uses less digits than its factorization.

21222102111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633352720 (or 633352718 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21222102111212 its reverse (21211120122212), we get a palindrome (42433222233424).

The spelling of 21222102111212 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred two million, one hundred eleven thousand, two hundred twelve".