1200000000000 has 336 divisors, whose sum is σ = 3999755842992. Its totient is φ = 320000000000.

The previous prime is 1199999999993. The next prime is 1200000000053. The reversal of 1200000000000 is 21.

It is a Harshad number since it is a multiple of its sum of digits (3).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 239999999998 + ... + 240000000002.

It is an arithmetic number, because the mean of its divisors is an integer number (11904035247).

Almost surely, 2^{1200000000000} is an apocalyptic number.

1200000000000 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 1200000000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1999877921496).

1200000000000 is an abundant number, since it is smaller than the sum of its proper divisors (2799755842992).

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

1200000000000 is an frugal number, since it uses more digits than its factorization.

1200000000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84 (or 10 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 3.

Adding to 1200000000000 its reverse (21), we get a palindrome (1200000000021).

The spelling of 1200000000000 in words is "one trillion, two hundred billion", and thus it is an aban number.