21220121122112 has 112 divisors (see below), whose sum is σ = 46530553420800. Its totient is φ = 9520889064960.

The previous prime is 21220121122093. The next prime is 21220121122127. The reversal of 21220121122112 is 21122112102212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 218132939 + ... + 218230197.

Almost surely, 2^{21220121122112} is an apocalyptic number.

21220121122112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21220121122112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23265276710400).

21220121122112 is an abundant number, since it is smaller than the sum of its proper divisors (25310432298688).

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

21220121122112 is a wasteful number, since it uses less digits than its factorization.

21220121122112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101284 (or 101274 counting only the distinct ones).

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

Adding to 21220121122112 its reverse (21122112102212), we get a palindrome (42342233224324).

The spelling of 21220121122112 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, one hundred twenty-two thousand, one hundred twelve".