2001311021 has 16 divisors (see below), whose sum is σ = 2130450240. Its totient is φ = 1874638080.

The previous prime is 2001311017. The next prime is 2001311041. The reversal of 2001311021 is 1201131002.

It is a cyclic number.

It is not a de Polignac number, because 2001311021 - 2² = 2001311017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001310993 and 2001311011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001311041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1160666 + ... + 1162388.

It is an arithmetic number, because the mean of its divisors is an integer number (133153140).

Almost surely, 2^2001311021 is an apocalyptic number.

It is an amenable number.

2001311021 is a deficient number, since it is larger than the sum of its proper divisors (129139219).

2001311021 is a wasteful number, since it uses less digits than its factorization.

2001311021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2396.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 2001311021 is about 44736.0148090998. The cubic root of 2001311021 is about 1260.1962869225.

Adding to 2001311021 its reverse (1201131002), we get a palindrome (3202442023).

The spelling of 2001311021 in words is "two billion, one million, three hundred eleven thousand, twenty-one".