12121122221000 has 128 divisors (see below), whose sum is σ = 30547329845760. Its totient is φ = 4475183328000.

The previous prime is 12121122220993. The next prime is 12121122221017. The reversal of 12121122221000 is 12222112121.

It is a self number, because there is not a number n which added to its sum of digits gives 12121122221000.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 289190045 + ... + 289231955.

It is an arithmetic number, because the mean of its divisors is an integer number (238651014420).

Almost surely, 2^{12121122221000} is an apocalyptic number.

12121122221000 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 12121122221000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15273664922880).

12121122221000 is an abundant number, since it is smaller than the sum of its proper divisors (18426207624760).

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

12121122221000 is a wasteful number, since it uses less digits than its factorization.

12121122221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64192 (or 64178 counting only the distinct ones).

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

Adding to 12121122221000 its reverse (12222112121), we get a palindrome (12133344333121).

The spelling of 12121122221000 in words is "twelve trillion, one hundred twenty-one billion, one hundred twenty-two million, two hundred twenty-one thousand".