2101231313 has 4 divisors (see below), whose sum is σ = 2102016000. Its totient is φ = 2100446628.

The previous prime is 2101231277. The next prime is 2101231333. The reversal of 2101231313 is 3131321012.

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 a de Polignac number, because none of the positive numbers 2^k-2101231313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2101231291 and 2101231300.

It is not an unprimeable number, because it can be changed into a prime (2101231333) 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, 388313 + ... + 393686.

It is an arithmetic number, because the mean of its divisors is an integer number (525504000).

Almost surely, 2^2101231313 is an apocalyptic number.

It is an amenable number.

2101231313 is a deficient number, since it is larger than the sum of its proper divisors (784687).

2101231313 is an equidigital number, since it uses as much as digits as its factorization.

2101231313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784686.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 2101231313 is about 45839.1897070618. The cubic root of 2101231313 is about 1280.8294008121.

Adding to 2101231313 its reverse (3131321012), we get a palindrome (5232552325).

It can be divided in two parts, 21012 and 31313, that added together give a palindrome (52325).

The spelling of 2101231313 in words is "two billion, one hundred one million, two hundred thirty-one thousand, three hundred thirteen".