2100110221021 has 4 divisors (see below), whose sum is σ = 2100129028092. Its totient is φ = 2100091413952.

The previous prime is 2100110221019. The next prime is 2100110221039. The reversal of 2100110221021 is 1201220110012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1487702241796 + 612407979225 = 1219714^2 + 782565^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100110221021 - 2¹ = 2100110221019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100110220992 and 2100110221010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100110227021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9235030 + ... + 9459703.

It is an arithmetic number, because the mean of its divisors is an integer number (525032257023).

Almost surely, 2^{2100110221021} is an apocalyptic number.

It is an amenable number.

2100110221021 is a deficient number, since it is larger than the sum of its proper divisors (18807071).

2100110221021 is a wasteful number, since it uses less digits than its factorization.

2100110221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18807070.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2100110221021 its reverse (1201220110012), we get a palindrome (3301330331033).

The spelling of 2100110221021 in words is "two trillion, one hundred billion, one hundred ten million, two hundred twenty-one thousand, twenty-one".