2101243021 has 4 divisors (see below), whose sum is σ = 2108668192. Its totient is φ = 2093817852.

The previous prime is 2101243019. The next prime is 2101243033. The reversal of 2101243021 is 1203421012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2101243021 - 2¹ = 2101243019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101242986 and 2101243004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101243621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3712161 + ... + 3712726.

It is an arithmetic number, because the mean of its divisors is an integer number (527167048).

Almost surely, 2^2101243021 is an apocalyptic number.

It is an amenable number.

2101243021 is a deficient number, since it is larger than the sum of its proper divisors (7425171).

2101243021 is an equidigital number, since it uses as much as digits as its factorization.

2101243021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7425170.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 2101243021 is about 45839.3174142024. The cubic root of 2101243021 is about 1280.8317797224.

Adding to 2101243021 its reverse (1203421012), we get a palindrome (3304664033).

The spelling of 2101243021 in words is "two billion, one hundred one million, two hundred forty-three thousand, twenty-one".