2100002110021 has 8 divisors (see below), whose sum is σ = 2115104733504. Its totient is φ = 2084952948000.

The previous prime is 2100002110007. The next prime is 2100002110043. The reversal of 2100002110021 is 1200112000012.

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 2100002110021 - 2²⁵ = 2099968555589 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 (2100002110001) 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, 13286521 + ... + 13443646.

It is an arithmetic number, because the mean of its divisors is an integer number (264388091688).

Almost surely, 2^{2100002110021} is an apocalyptic number.

It is an amenable number.

2100002110021 is a deficient number, since it is larger than the sum of its proper divisors (15102623483).

2100002110021 is a wasteful number, since it uses less digits than its factorization.

2100002110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26730731.

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

Adding to 2100002110021 its reverse (1200112000012), we get a palindrome (3300114110033).

The spelling of 2100002110021 in words is "two trillion, one hundred billion, two million, one hundred ten thousand, twenty-one".