2100322121 has 4 divisors (see below), whose sum is σ = 2103962772. Its totient is φ = 2096681472.

The previous prime is 2100322039. The next prime is 2100322127. The reversal of 2100322121 is 1212230012.

It is a happy number.

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 1527246400 + 573075721 = 39080^2 + 23939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2100322121 is a prime.

It is a super-2 number, since 2×2100322121² = 8822706023923877282, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100322096 and 2100322105.

It is not an unprimeable number, because it can be changed into a prime (2100322127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1819460 + ... + 1820613.

It is an arithmetic number, because the mean of its divisors is an integer number (525990693).

Almost surely, 2^2100322121 is an apocalyptic number.

It is an amenable number.

2100322121 is a deficient number, since it is larger than the sum of its proper divisors (3640651).

2100322121 is an equidigital number, since it uses as much as digits as its factorization.

2100322121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3640650.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2100322121 is about 45829.2714430417. The cubic root of 2100322121 is about 1280.6446380592.

Adding to 2100322121 its reverse (1212230012), we get a palindrome (3312552133).

The spelling of 2100322121 in words is "two billion, one hundred million, three hundred twenty-two thousand, one hundred twenty-one".