1200001000000 has 588 divisors, whose sum is σ = 3380736413520. Its totient is φ = 418992000000.

The previous prime is 1200000999893. The next prime is 1200001000027. The reversal of 1200001000000 is 1000021.

It is a Harshad number since it is a multiple of its sum of digits (4).

It is an unprimeable number.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 20338999971 + ... + 20339000029.

Almost surely, 2^{1200001000000} is an apocalyptic number.

1200001000000 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 1200001000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1690368206760).

1200001000000 is an abundant number, since it is smaller than the sum of its proper divisors (2180735413520).

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

1200001000000 is an frugal number, since it uses more digits than its factorization.

1200001000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 120 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 4.

Adding to 1200001000000 its reverse (1000021), we get a palindrome (1200002000021).

The spelling of 1200001000000 in words is "one trillion, two hundred billion, one million", and thus it is an aban number.