2100220111021 has 4 divisors (see below), whose sum is σ = 2100337400700. Its totient is φ = 2100102821344.

The previous prime is 2100220111013. The next prime is 2100220111057. The reversal of 2100220111021 is 1201110220012.

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 443104566921 + 1657115544100 = 665661^2 + 1287290^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100220111021 - 2³ = 2100220111013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100220110992 and 2100220111010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100220111921) 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, 58617976 + ... + 58653793.

It is an arithmetic number, because the mean of its divisors is an integer number (525084350175).

Almost surely, 2^{2100220111021} is an apocalyptic number.

It is an amenable number.

2100220111021 is a deficient number, since it is larger than the sum of its proper divisors (117289679).

2100220111021 is a wasteful number, since it uses less digits than its factorization.

2100220111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117289678.

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

Adding to 2100220111021 its reverse (1201110220012), we get a palindrome (3301330331033).

The spelling of 2100220111021 in words is "two trillion, one hundred billion, two hundred twenty million, one hundred eleven thousand, twenty-one".