2001020110021 has 8 divisors (see below), whose sum is σ = 2103955572600. Its totient is φ = 1900346965440.

The previous prime is 2001020110009. The next prime is 2001020110091. The reversal of 2001020110021 is 1200110201002.

It can be written as a sum of positive squares in 4 ways, for example, as 90833520996 + 1910186589025 = 301386^2 + 1382095^2 .

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 2001020110021 - 2⁵ = 2001020109989 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 (2001020110091) 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, 565577686 + ... + 565581223.

It is an arithmetic number, because the mean of its divisors is an integer number (262994446575).

Almost surely, 2^{2001020110021} is an apocalyptic number.

It is an amenable number.

2001020110021 is a deficient number, since it is larger than the sum of its proper divisors (102935462579).

2001020110021 is a wasteful number, since it uses less digits than its factorization.

2001020110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131158999.

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

Adding to 2001020110021 its reverse (1200110201002), we get a palindrome (3201130311023).

The spelling of 2001020110021 in words is "two trillion, one billion, twenty million, one hundred ten thousand, twenty-one".