12221012112 has 80 divisors (see below), whose sum is σ = 32342120448. Its totient is φ = 3974382720.

The previous prime is 12221012087. The next prime is 12221012117. The reversal of 12221012112 is 21121012221.

It is a junction number, because it is equal to n+sod(n) for n = 12221012091 and 12221012100.

It is not an unprimeable number, because it can be changed into a prime (12221012117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2125113 + ... + 2130855.

Almost surely, 2^12221012112 is an apocalyptic number.

12221012112 is a gapful number since it is divisible by the number (12) 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 12221012112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16171060224).

12221012112 is an abundant number, since it is smaller than the sum of its proper divisors (20121108336).

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

12221012112 is a wasteful number, since it uses less digits than its factorization.

12221012112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6828 (or 6822 counting only the distinct ones).

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

Adding to 12221012112 its reverse (21121012221), we get a palindrome (33342024333).

The spelling of 12221012112 in words is "twelve billion, two hundred twenty-one million, twelve thousand, one hundred twelve".