2001101021 has 8 divisors (see below), whose sum is σ = 2011370400. Its totient is φ = 1990844848.

The previous prime is 2001101017. The next prime is 2001101023. The reversal of 2001101021 is 1201011002.

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 2001101021 - 2² = 2001101017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001101023) 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 7 ways as a sum of consecutive naturals, for example, 457955 + ... + 462303.

It is an arithmetic number, because the mean of its divisors is an integer number (251421300).

Almost surely, 2^2001101021 is an apocalyptic number.

It is an amenable number.

2001101021 is a deficient number, since it is larger than the sum of its proper divisors (10269379).

2001101021 is a wasteful number, since it uses less digits than its factorization.

2001101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6603.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 2001101021 is about 44733.6676452982. The cubic root of 2001101021 is about 1260.1522074042.

Adding to 2001101021 its reverse (1201011002), we get a palindrome (3202112023).

The spelling of 2001101021 in words is "two billion, one million, one hundred one thousand, twenty-one".