21022204112 has 80 divisors (see below), whose sum is σ = 50385025152. Its totient is φ = 8274147840.

The previous prime is 21022204111. The next prime is 21022204121. The reversal of 21022204112 is 21140222012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022204111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250187 + ... + 323477.

Almost surely, 2^21022204112 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 21022204112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25192512576).

21022204112 is an abundant number, since it is smaller than the sum of its proper divisors (29362821040).

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

21022204112 is a wasteful number, since it uses less digits than its factorization.

21022204112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73516 (or 73510 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21022204112 its reverse (21140222012), we get a palindrome (42162426124).

The spelling of 21022204112 in words is "twenty-one billion, twenty-two million, two hundred four thousand, one hundred twelve".