1001200002001 has 4 divisors (see below), whose sum is σ = 1001256876900. Its totient is φ = 1001143127104.

The previous prime is 1001200001999. The next prime is 1001200002133. The reversal of 1001200002001 is 1002000021001.

1001200002001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 663117062400 + 338082939601 = 814320^2 + 581449^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001200002001 - 2¹ = 1001200001999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001200002301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28411036 + ... + 28446253.

It is an arithmetic number, because the mean of its divisors is an integer number (250314219225).

Almost surely, 2^{1001200002001} is an apocalyptic number.

It is an amenable number.

1001200002001 is a deficient number, since it is larger than the sum of its proper divisors (56874899).

1001200002001 is an equidigital number, since it uses as much as digits as its factorization.

1001200002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56874898.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 1001200002001 its reverse (1002000021001), we get a palindrome (2003200023002).

The spelling of 1001200002001 in words is "one trillion, one billion, two hundred million, two thousand, one".