21002222101112 has 64 divisors (see below), whose sum is σ = 45540175622400. Its totient is φ = 8894001726720.

The previous prime is 21002222101067. The next prime is 21002222101117. The reversal of 21002222101112 is 21110122220012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002222101117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6254303 + ... + 9006705.

It is an arithmetic number, because the mean of its divisors is an integer number (711565244100).

Almost surely, 2^{21002222101112} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21002222101112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22770087811200).

21002222101112 is an abundant number, since it is smaller than the sum of its proper divisors (24537953521288).

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

21002222101112 is a wasteful number, since it uses less digits than its factorization.

21002222101112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2754036 (or 2754032 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21002222101112 its reverse (21110122220012), we get a palindrome (42112344321124).

The spelling of 21002222101112 in words is "twenty-one trillion, two billion, two hundred twenty-two million, one hundred one thousand, one hundred twelve".