21220122212112 has 20 divisors (see below), whose sum is σ = 54818649048080. Its totient is φ = 7073374070688.

The previous prime is 21220122212111. The next prime is 21220122212117. The reversal of 21220122212112 is 21121222102212.

It is not an unprimeable number, because it can be changed into a prime (21220122212111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221042939662 + ... + 221042939757.

It is an arithmetic number, because the mean of its divisors is an integer number (2740932452404).

Almost surely, 2^{21220122212112} is an apocalyptic number.

It is an amenable number.

21220122212112 is an abundant number, since it is smaller than the sum of its proper divisors (33598526835968).

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

21220122212112 is a wasteful number, since it uses less digits than its factorization.

21220122212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442085879430 (or 442085879424 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21220122212112 its reverse (21121222102212), we get a palindrome (42341344314324).

The spelling of 21220122212112 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-two million, two hundred twelve thousand, one hundred twelve".