2001221011 has 8 divisors (see below), whose sum is σ = 2158920864. Its totient is φ = 1847963520.

The previous prime is 2001220987. The next prime is 2001221039. The reversal of 2001221011 is 1101221002.

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

It is a cyclic number.

It is not a de Polignac number, because 2001221011 - 2¹⁷ = 2001089939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001221071) 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, 1109655 + ... + 1111456.

It is an arithmetic number, because the mean of its divisors is an integer number (269865108).

Almost surely, 2^2001221011 is an apocalyptic number.

2001221011 is a deficient number, since it is larger than the sum of its proper divisors (157699853).

2001221011 is a wasteful number, since it uses less digits than its factorization.

2001221011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2221181.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 2001221011 is about 44735.0087850668. The cubic root of 2001221011 is about 1260.1773939790.

Adding to 2001221011 its reverse (1101221002), we get a palindrome (3102442013).

Subtracting from 2001221011 its reverse (1101221002), we obtain a palindrome (900000009).

The spelling of 2001221011 in words is "two billion, one million, two hundred twenty-one thousand, eleven".