2001211011001 has 4 divisors (see below), whose sum is σ = 2001420549504. Its totient is φ = 2001001472500.

The previous prime is 2001211010999. The next prime is 2001211011011. The reversal of 2001211011001 is 1001101121002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2001211011001 - 2¹ = 2001211010999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001211011011) 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, 104754925 + ... + 104774026.

It is an arithmetic number, because the mean of its divisors is an integer number (500355137376).

Almost surely, 2^{2001211011001} is an apocalyptic number.

It is an amenable number.

2001211011001 is a deficient number, since it is larger than the sum of its proper divisors (209538503).

2001211011001 is an equidigital number, since it uses as much as digits as its factorization.

2001211011001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209538502.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 2001211011001 its reverse (1001101121002), we get a palindrome (3002312132003).

The spelling of 2001211011001 in words is "two trillion, one billion, two hundred eleven million, eleven thousand, one".