21101222221112 has 16 divisors (see below), whose sum is σ = 43161590907000. Its totient is φ = 9591464645920.

The previous prime is 21101222221103. The next prime is 21101222221187. The reversal of 21101222221112 is 21112222210112.

It is a congruent number.

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, 119893307987 + ... + 119893308162.

Almost surely, 2^{21101222221112} is an apocalyptic number.

21101222221112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21101222221112 is an abundant number, since it is smaller than the sum of its proper divisors (22060368685888).

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

21101222221112 is a wasteful number, since it uses less digits than its factorization.

21101222221112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239786616166 (or 239786616162 counting only the distinct ones).

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

Adding to 21101222221112 its reverse (21112222210112), we get a palindrome (42213444431224).

The spelling of 21101222221112 in words is "twenty-one trillion, one hundred one billion, two hundred twenty-two million, two hundred twenty-one thousand, one hundred twelve".