1200021200001 has 48 divisors (see below), whose sum is σ = 2000319100416. Its totient is φ = 686660894208.

The previous prime is 1200021199999. The next prime is 1200021200003. The reversal of 1200021200001 is 1000021200021.

It is an interprime number because it is at equal distance from previous prime (1200021199999) and next prime (1200021200003).

It is not a de Polignac number, because 1200021200001 - 2¹ = 1200021199999 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1200021200003) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3469425 + ... + 3799598.

It is an arithmetic number, because the mean of its divisors is an integer number (41673314592).

Almost surely, 2^{1200021200001} is an apocalyptic number.

It is an amenable number.

1200021200001 is a deficient number, since it is larger than the sum of its proper divisors (800297900415).

1200021200001 is a wasteful number, since it uses less digits than its factorization.

1200021200001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7269142 (or 7269139 counting only the distinct ones).

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

Adding to 1200021200001 its reverse (1000021200021), we get a palindrome (2200042400022).

The spelling of 1200021200001 in words is "one trillion, two hundred billion, twenty-one million, two hundred thousand, one".