21221102212112 has 160 divisors (see below), whose sum is σ = 46290602711808. Its totient is φ = 9340620800000.

The previous prime is 21221102212111. The next prime is 21221102212129. The reversal of 21221102212112 is 21121220112212.

It is not an unprimeable number, because it can be changed into a prime (21221102212111) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 844742912 + ... + 844768032.

Almost surely, 2^{21221102212112} is an apocalyptic number.

21221102212112 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 21221102212112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23145301355904).

21221102212112 is an abundant number, since it is smaller than the sum of its proper divisors (25069500499696).

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

21221102212112 is a wasteful number, since it uses less digits than its factorization.

21221102212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26049 (or 26043 counting only the distinct ones).

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

Adding to 21221102212112 its reverse (21121220112212), we get a palindrome (42342322324324).

The spelling of 21221102212112 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred two million, two hundred twelve thousand, one hundred twelve".