12221112012 has 12 divisors (see below), whose sum is σ = 28515928056. Its totient is φ = 4073704000.

The previous prime is 12221112011. The next prime is 12221112017. The reversal of 12221112012 is 21021112221.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 12221111982 and 12221112000.

It is not an unprimeable number, because it can be changed into a prime (12221112011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 509212989 + ... + 509213012.

It is an arithmetic number, because the mean of its divisors is an integer number (2376327338).

Almost surely, 2^12221112012 is an apocalyptic number.

12221112012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12221112012 is an abundant number, since it is smaller than the sum of its proper divisors (16294816044).

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

12221112012 is a wasteful number, since it uses less digits than its factorization.

12221112012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018426008 (or 1018426006 counting only the distinct ones).

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

Adding to 12221112012 its reverse (21021112221), we get a palindrome (33242224233).

The spelling of 12221112012 in words is "twelve billion, two hundred twenty-one million, one hundred twelve thousand, twelve".