2100310300021 has 4 divisors (see below), whose sum is σ = 2101929661612. Its totient is φ = 2098690938432.

The previous prime is 2100310300007. The next prime is 2100310300027. The reversal of 2100310300021 is 1200030130012.

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 1918931415025 + 181378884996 = 1385255^2 + 425886^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100310300021 - 2¹¹ = 2100310297973 is a prime.

It is a super-2 number, since 2×2100310300021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100310299974 and 2100310300010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100310300027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 809678850 + ... + 809681443.

It is an arithmetic number, because the mean of its divisors is an integer number (525482415403).

Almost surely, 2^{2100310300021} is an apocalyptic number.

It is an amenable number.

2100310300021 is a deficient number, since it is larger than the sum of its proper divisors (1619361591).

2100310300021 is a wasteful number, since it uses less digits than its factorization.

2100310300021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1619361590.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 2100310300021 its reverse (1200030130012), we get a palindrome (3300340430033).

The spelling of 2100310300021 in words is "two trillion, one hundred billion, three hundred ten million, three hundred thousand, twenty-one".