2101111013 has 4 divisors (see below), whose sum is σ = 2101583148. Its totient is φ = 2100638880.

The previous prime is 2101111007. The next prime is 2101111027. The reversal of 2101111013 is 3101111012.

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 1923875044 + 177235969 = 43862^2 + 13313^2 .

It is a cyclic number.

It is not a de Polignac number, because 2101111013 - 2¹⁶ = 2101045477 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101110985 and 2101111003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101111003) 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, 229328 + ... + 238313.

It is an arithmetic number, because the mean of its divisors is an integer number (525395787).

Almost surely, 2^2101111013 is an apocalyptic number.

It is an amenable number.

2101111013 is a deficient number, since it is larger than the sum of its proper divisors (472135).

2101111013 is an equidigital number, since it uses as much as digits as its factorization.

2101111013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472134.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 2101111013 is about 45837.8774923098. The cubic root of 2101111013 is about 1280.8049569354.

Adding to 2101111013 its reverse (3101111012), we get a palindrome (5202222025).

Subtracting 2101111013 from its reverse (3101111012), we obtain a palindrome (999999999).

The spelling of 2101111013 in words is "two billion, one hundred one million, one hundred eleven thousand, thirteen".