2001221022011 has 4 divisors (see below), whose sum is σ = 2001276943800. Its totient is φ = 2001165100224.

The previous prime is 2001221021977. The next prime is 2001221022023. The reversal of 2001221022011 is 1102201221002.

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

It is a cyclic number.

It is not a de Polignac number, because 2001221022011 - 2¹⁰ = 2001221020987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001221022211) 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, 27907181 + ... + 27978798.

It is an arithmetic number, because the mean of its divisors is an integer number (500319235950).

Almost surely, 2^{2001221022011} is an apocalyptic number.

2001221022011 is a deficient number, since it is larger than the sum of its proper divisors (55921789).

2001221022011 is an equidigital number, since it uses as much as digits as its factorization.

2001221022011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55921788.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2001221022011 its reverse (1102201221002), we get a palindrome (3103422243013).

The spelling of 2001221022011 in words is "two trillion, one billion, two hundred twenty-one million, twenty-two thousand, eleven".