21202220112 has 80 divisors (see below), whose sum is σ = 56396307072. Its totient is φ = 6858846720.

The previous prime is 21202220077. The next prime is 21202220183. The reversal of 21202220112 is 21102220212.

It is a super-3 number, since 3×21202220112³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21202220091 and 21202220100.

It is a congruent number.

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, 690037 + ... + 720107.

Almost surely, 2^21202220112 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 21202220112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28198153536).

21202220112 is an abundant number, since it is smaller than the sum of its proper divisors (35194086960).

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

21202220112 is a wasteful number, since it uses less digits than its factorization.

21202220112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30516 (or 30510 counting only the distinct ones).

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

Adding to 21202220112 its reverse (21102220212), we get a palindrome (42304440324).

The spelling of 21202220112 in words is "twenty-one billion, two hundred two million, two hundred twenty thousand, one hundred twelve".