12221211112012 has 144 divisors (see below), whose sum is σ = 25873450057728. Its totient is φ = 4946482356480.

The previous prime is 12221211112009. The next prime is 12221211112037. The reversal of 12221211112012 is 21021111212221.

It is a happy number.

It is a super-2 number, since 2×12221211112012² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 212303538 + ... + 212361094.

It is an arithmetic number, because the mean of its divisors is an integer number (179676736512).

Almost surely, 2^{12221211112012} 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 12221211112012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12936725028864).

12221211112012 is an abundant number, since it is smaller than the sum of its proper divisors (13652238945716).

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

12221211112012 is a wasteful number, since it uses less digits than its factorization.

12221211112012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57824 (or 57793 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 12221211112012 its reverse (21021111212221), we get a palindrome (33242322324233).

The spelling of 12221211112012 in words is "twelve trillion, two hundred twenty-one billion, two hundred eleven million, one hundred twelve thousand, twelve".