21222020112 has 40 divisors (see below), whose sum is σ = 54828943104. Its totient is φ = 7073311104.

The previous prime is 21222020089. The next prime is 21222020117. The reversal of 21222020112 is 21102022212.

It is a junction number, because it is equal to n+sod(n) for n = 21222020091 and 21222020100.

It is not an unprimeable number, because it can be changed into a prime (21222020117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 765078 + ... + 792330.

Almost surely, 2^21222020112 is an apocalyptic number.

It is an amenable number.

21222020112 is an abundant number, since it is smaller than the sum of its proper divisors (33606922992).

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

21222020112 is a wasteful number, since it uses less digits than its factorization.

21222020112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43487 (or 43481 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21222020112 its reverse (21102022212), we get a palindrome (42324042324).

The spelling of 21222020112 in words is "twenty-one billion, two hundred twenty-two million, twenty thousand, one hundred twelve".