21220101112 has 64 divisors (see below), whose sum is σ = 46668888000. Its totient is φ = 9041558400.

The previous prime is 21220101043. The next prime is 21220101137. The reversal of 21220101112 is 21110102212.

It is a junction number, because it is equal to n+sod(n) for n = 21220101092 and 21220101101.

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, 452362 + ... + 497062.

It is an arithmetic number, because the mean of its divisors is an integer number (729201375).

Almost surely, 2^21220101112 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 21220101112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23334444000).

21220101112 is an abundant number, since it is smaller than the sum of its proper divisors (25448786888).

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

21220101112 is a wasteful number, since it uses less digits than its factorization.

21220101112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44901 (or 44883 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21220101112 its reverse (21110102212), we get a palindrome (42330203324).

The spelling of 21220101112 in words is "twenty-one billion, two hundred twenty million, one hundred one thousand, one hundred twelve".