1001000001200 has 60 divisors (see below), whose sum is σ = 2405284593600. Its totient is φ = 400336385280.

The previous prime is 1001000001193. The next prime is 1001000001203. The reversal of 1001000001200 is 21000001001.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (5).

It is not an unprimeable number, because it can be changed into a prime (1001000001203) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2363201 + ... + 2754399.

It is an arithmetic number, because the mean of its divisors is an integer number (40088076560).

Almost surely, 2^{1001000001200} is an apocalyptic number.

1001000001200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001000001200 is an abundant number, since it is smaller than the sum of its proper divisors (1404284592400).

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

1001000001200 is a wasteful number, since it uses less digits than its factorization.

1001000001200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397614 (or 397603 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 5.

Adding to 1001000001200 its reverse (21000001001), we get a palindrome (1022000002201).

The spelling of 1001000001200 in words is "one trillion, one billion, one thousand, two hundred".