21222302112 has 144 divisors (see below), whose sum is σ = 66917279520. Its totient is φ = 6325516800.

The previous prime is 21222302099. The next prime is 21222302131. The reversal of 21222302112 is 21120322212.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×21222302112² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 138339 + ... + 248157.

It is an arithmetic number, because the mean of its divisors is an integer number (464703330).

Almost surely, 2^21222302112 is an apocalyptic number.

21222302112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21222302112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33458639760).

21222302112 is an abundant number, since it is smaller than the sum of its proper divisors (45694977408).

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

21222302112 is a wasteful number, since it uses less digits than its factorization.

21222302112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109907 (or 109896 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21222302112 its reverse (21120322212), we get a palindrome (42342624324).

The spelling of 21222302112 in words is "twenty-one billion, two hundred twenty-two million, three hundred two thousand, one hundred twelve".