1200022121000 has 384 divisors, whose sum is σ = 3083216348160. Its totient is φ = 436632768000.

The previous prime is 1200022120951. The next prime is 1200022121003. The reversal of 1200022121000 is 1212200021.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1200022121003) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 1756986659 + ... + 1756987341.

It is an arithmetic number, because the mean of its divisors is an integer number (8029209240).

Almost surely, 2^{1200022121000} is an apocalyptic number.

1200022121000 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 1200022121000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1541608174080).

1200022121000 is an abundant number, since it is smaller than the sum of its proper divisors (1883194227160).

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

1200022121000 is a wasteful number, since it uses less digits than its factorization.

1200022121000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930 (or 897 counting only the distinct ones).

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

Adding to 1200022121000 its reverse (1212200021), we get a palindrome (1201234321021).

The spelling of 1200022121000 in words is "one trillion, two hundred billion, twenty-two million, one hundred twenty-one thousand".