2001211201001 has 8 divisors (see below), whose sum is σ = 2022348968640. Its totient is φ = 1980123943248.

The previous prime is 2001211200991. The next prime is 2001211201009. The reversal of 2001211201001 is 1001021121002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001211201001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001211201009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12547811 + ... + 12706296.

It is an arithmetic number, because the mean of its divisors is an integer number (252793621080).

Almost surely, 2^{2001211201001} is an apocalyptic number.

It is an amenable number.

2001211201001 is a deficient number, since it is larger than the sum of its proper divisors (21137767639).

2001211201001 is a wasteful number, since it uses less digits than its factorization.

2001211201001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25254943.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 2001211201001 its reverse (1001021121002), we get a palindrome (3002232322003).

The spelling of 2001211201001 in words is "two trillion, one billion, two hundred eleven million, two hundred one thousand, one".