12211221211000 has 256 divisors, whose sum is σ = 33157349222400. Its totient is φ = 4122518400000.

The previous prime is 12211221210989. The next prime is 12211221211001. The reversal of 12211221211000 is 11212211221.

It is a super-2 number, since 2×12211221211000² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211221211001) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1744207500 + ... + 1744214500.

It is an arithmetic number, because the mean of its divisors is an integer number (129520895400).

Almost surely, 2^{12211221211000} is an apocalyptic number.

12211221211000 is a gapful number since it is divisible by the number (10) 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 12211221211000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16578674611200).

12211221211000 is an abundant number, since it is smaller than the sum of its proper divisors (20946128011400).

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

12211221211000 is a wasteful number, since it uses less digits than its factorization.

12211221211000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10815 (or 10801 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 12211221211000 its reverse (11212211221), we get a palindrome (12222433422221).

The spelling of 12211221211000 in words is "twelve trillion, two hundred eleven billion, two hundred twenty-one million, two hundred eleven thousand".