2001100331021 has 16 divisors (see below), whose sum is σ = 2187845391168. Its totient is φ = 1815164073600.

The previous prime is 2001100330967. The next prime is 2001100331053. The reversal of 2001100331021 is 1201330011002.

It is a cyclic number.

It is not a de Polignac number, because 2001100331021 - 2³⁸ = 1726222424077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001100330987 and 2001100331005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001100331821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9220526 + ... + 9435056.

It is an arithmetic number, because the mean of its divisors is an integer number (136740336948).

Almost surely, 2^{2001100331021} is an apocalyptic number.

It is an amenable number.

2001100331021 is a deficient number, since it is larger than the sum of its proper divisors (186745060147).

2001100331021 is a wasteful number, since it uses less digits than its factorization.

2001100331021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216412.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 2001100331021 its reverse (1201330011002), we get a palindrome (3202430342023).

The spelling of 2001100331021 in words is "two trillion, one billion, one hundred million, three hundred thirty-one thousand, twenty-one".