2101320013 has 4 divisors (see below), whose sum is σ = 2262960028. Its totient is φ = 1939680000.

The previous prime is 2101319999. The next prime is 2101320017. The reversal of 2101320013 is 3100231012.

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 293539689 + 1807780324 = 17133^2 + 42518^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101320013 - 2⁹ = 2101319501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 161640001 = 2101320013 / (2 + 1 + 0 + 1 + 3 + 2 + 0 + 0 + 1 + 3).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101319975 and 2101320002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101320017) 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, 80819988 + ... + 80820013.

It is an arithmetic number, because the mean of its divisors is an integer number (565740007).

Almost surely, 2^2101320013 is an apocalyptic number.

It is an amenable number.

2101320013 is a deficient number, since it is larger than the sum of its proper divisors (161640015).

2101320013 is a wasteful number, since it uses less digits than its factorization.

2101320013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161640014.

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

The square root of 2101320013 is about 45840.1572095908. The cubic root of 2101320013 is about 1280.8474232558.

Adding to 2101320013 its reverse (3100231012), we get a palindrome (5201551025).

The spelling of 2101320013 in words is "two billion, one hundred one million, three hundred twenty thousand, thirteen".