2001001001211 has 16 divisors (see below), whose sum is σ = 3120469398400. Its totient is φ = 1263790105704.

The previous prime is 2001001001191. The next prime is 2001001001221. The reversal of 2001001001211 is 1121001001002.

It is a happy number.

It is not a de Polignac number, because 2001001001211 - 2¹⁷ = 2001000870139 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001001001193 and 2001001001202.

It is not an unprimeable number, because it can be changed into a prime (2001001001221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1950292861 + ... + 1950293886.

It is an arithmetic number, because the mean of its divisors is an integer number (195029337400).

Almost surely, 2^{2001001001211} is an apocalyptic number.

2001001001211 is a deficient number, since it is larger than the sum of its proper divisors (1119468397189).

2001001001211 is a wasteful number, since it uses less digits than its factorization.

2001001001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3900586775 (or 3900586769 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 2001001001211 its reverse (1121001001002), we get a palindrome (3122002002213).

The spelling of 2001001001211 in words is "two trillion, one billion, one million, one thousand, two hundred eleven".