1001200001000 has 64 divisors (see below), whose sum is σ = 2363541083280. Its totient is φ = 396935884800.

The previous prime is 1001200000987. The next prime is 1001200001051. The reversal of 1001200001000 is 1000021001.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 107702884 + 1001092298116 = 10378^2 + 1000546^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4317089 + ... + 4543088.

Almost surely, 2^{1001200001000} is an apocalyptic number.

1001200001000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001200001000 is an abundant number, since it is smaller than the sum of its proper divisors (1362341082280).

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

1001200001000 is a wasteful number, since it uses less digits than its factorization.

1001200001000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8860311 (or 8860297 counting only the distinct ones).

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

Adding to 1001200001000 its reverse (1000021001), we get a palindrome (1002200022001).

The spelling of 1001200001000 in words is "one trillion, one billion, two hundred million, one thousand".