21221102112 has 96 divisors (see below), whose sum is σ = 63710623872. Its totient is φ = 6058665984.

The previous prime is 21221102087. The next prime is 21221102131. The reversal of 21221102112 is 21120112212.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 21221102091 and 21221102100.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 951958 + ... + 973994.

It is an arithmetic number, because the mean of its divisors is an integer number (663652332).

Almost surely, 2^21221102112 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 21221102112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31855311936).

21221102112 is an abundant number, since it is smaller than the sum of its proper divisors (42489521760).

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

21221102112 is a wasteful number, since it uses less digits than its factorization.

21221102112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23490 (or 23482 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21221102112 its reverse (21120112212), we get a palindrome (42341214324).

The spelling of 21221102112 in words is "twenty-one billion, two hundred twenty-one million, one hundred two thousand, one hundred twelve".