2001211212011 has 4 divisors (see below), whose sum is σ = 2183139504024. Its totient is φ = 1819282920000.

The previous prime is 2001211211971. The next prime is 2001211212019. The reversal of 2001211212011 is 1102121121002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001211212011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001211212019) 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, 90964145990 + ... + 90964146011.

It is an arithmetic number, because the mean of its divisors is an integer number (545784876006).

Almost surely, 2^{2001211212011} is an apocalyptic number.

2001211212011 is a deficient number, since it is larger than the sum of its proper divisors (181928292013).

2001211212011 is a wasteful number, since it uses less digits than its factorization.

2001211212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181928292012.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2001211212011 its reverse (1102121121002), we get a palindrome (3103332333013).

The spelling of 2001211212011 in words is "two trillion, one billion, two hundred eleven million, two hundred twelve thousand, eleven".