2100111210021 has 16 divisors (see below), whose sum is σ = 3137266870848. Its totient is φ = 1238394816000.

The previous prime is 2100111210013. The next prime is 2100111210023. The reversal of 2100111210021 is 1200121110012.

It is not a de Polignac number, because 2100111210021 - 2³ = 2100111210013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2100111209979 and 2100111210006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100111210023) 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, 859995180 + ... + 859997621.

It is an arithmetic number, because the mean of its divisors is an integer number (196079179428).

Almost surely, 2^{2100111210021} is an apocalyptic number.

It is an amenable number.

2100111210021 is a deficient number, since it is larger than the sum of its proper divisors (1037155660827).

2100111210021 is a wasteful number, since it uses less digits than its factorization.

2100111210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1719992852.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 2100111210021 its reverse (1200121110012), we get a palindrome (3300232320033).

It can be divided in two parts, 2100111 and 210021, that added together give a palindrome (2310132).

The spelling of 2100111210021 in words is "two trillion, one hundred billion, one hundred eleven million, two hundred ten thousand, twenty-one".