1200021002001 has 12 divisors (see below), whose sum is σ = 1743743094912. Its totient is φ = 795223497336.

The previous prime is 1200021001981. The next prime is 1200021002017. The reversal of 1200021002001 is 1002001200021.

It is not a de Polignac number, because 1200021002001 - 2¹¹ = 1200020999953 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1200021007001) 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, 399207081 + ... + 399210086.

It is an arithmetic number, because the mean of its divisors is an integer number (145311924576).

Almost surely, 2^{1200021002001} is an apocalyptic number.

It is an amenable number.

1200021002001 is a deficient number, since it is larger than the sum of its proper divisors (543722092911).

1200021002001 is a wasteful number, since it uses less digits than its factorization.

1200021002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798417340 (or 798417337 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1200021002001 its reverse (1002001200021), we get a palindrome (2202022202022).

The spelling of 1200021002001 in words is "one trillion, two hundred billion, twenty-one million, two thousand, one".