2121100313 has 4 divisors (see below), whose sum is σ = 2121197568. Its totient is φ = 2121003060.

The previous prime is 2121100249. The next prime is 2121100361. The reversal of 2121100313 is 3130011212.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2121100313 - 2⁶ = 2121100249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121100393) 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, 908 + ... + 65138.

It is an arithmetic number, because the mean of its divisors is an integer number (530299392).

Almost surely, 2^2121100313 is an apocalyptic number.

It is an amenable number.

2121100313 is a deficient number, since it is larger than the sum of its proper divisors (97255).

2121100313 is an equidigital number, since it uses as much as digits as its factorization.

2121100313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97254.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 2121100313 is about 46055.4048185444. The cubic root of 2121100313 is about 1284.8538672158.

Adding to 2121100313 its reverse (3130011212), we get a palindrome (5251111525).

The spelling of 2121100313 in words is "two billion, one hundred twenty-one million, one hundred thousand, three hundred thirteen".