2000121221000 has 256 divisors, whose sum is σ = 5486697216000. Its totient is φ = 668167315200.

The previous prime is 2000121220987. The next prime is 2000121221039. The reversal of 2000121221000 is 1221210002.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 126111071 + ... + 126126929.

It is an arithmetic number, because the mean of its divisors is an integer number (21432411000).

Almost surely, 2^{2000121221000} is an apocalyptic number.

2000121221000 is a gapful number since it is divisible by the number (20) 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 2000121221000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2743348608000).

2000121221000 is an abundant number, since it is smaller than the sum of its proper divisors (3486575995000).

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

2000121221000 is a wasteful number, since it uses less digits than its factorization.

2000121221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16349 (or 16335 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 2000121221000 its reverse (1221210002), we get a palindrome (2001342431002).

The spelling of 2000121221000 in words is "two trillion, one hundred twenty-one million, two hundred twenty-one thousand".