12211212221000 has 64 divisors (see below), whose sum is σ = 30772254829680. Its totient is φ = 4508755276800.

The previous prime is 12211212220939. The next prime is 12211212221003. The reversal of 12211212221000 is 12221211221.

It can be written as a sum of positive squares in 8 ways, for example, as 1233374609476 + 10977837611524 = 1110574^2 + 3313282^2 .

It is a super-2 number, since 2×12211212221000² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12211212221000.

It is not an unprimeable number, because it can be changed into a prime (12211212221003) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 469649009 + ... + 469675008.

Almost surely, 2^{12211212221000} is an apocalyptic number.

12211212221000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12211212221000 is an abundant number, since it is smaller than the sum of its proper divisors (18561042608680).

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

12211212221000 is a wasteful number, since it uses less digits than its factorization.

12211212221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939324051 (or 939324037 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12211212221000 its reverse (12221211221), we get a palindrome (12223433432221).

The spelling of 12211212221000 in words is "twelve trillion, two hundred eleven billion, two hundred twelve million, two hundred twenty-one thousand".