21221011101112 has 32 divisors (see below), whose sum is σ = 39857512575600. Its totient is φ = 10592354905344.

The previous prime is 21221011101083. The next prime is 21221011101119. The reversal of 21221011101112 is 21110111012212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221011101119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11436339 + ... + 13161757.

Almost surely, 2^{21221011101112} is an apocalyptic number.

It is an amenable number.

21221011101112 is a deficient number, since it is larger than the sum of its proper divisors (18636501474488).

21221011101112 is a wasteful number, since it uses less digits than its factorization.

21221011101112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1728055 (or 1728051 counting only the distinct ones).

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

Adding to 21221011101112 its reverse (21110111012212), we get a palindrome (42331122113324).

The spelling of 21221011101112 in words is "twenty-one trillion, two hundred twenty-one billion, eleven million, one hundred one thousand, one hundred twelve".