20131213440313 has 4 divisors (see below), whose sum is σ = 20219122669540. Its totient is φ = 20043304211088.

The previous prime is 20131213440311. The next prime is 20131213440341. The reversal of 20131213440313 is 31304431213102.

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 18574488094969 + 1556725345344 = 4309813^2 + 1247688^2 .

It is a cyclic number.

It is not a de Polignac number, because 20131213440313 - 2¹ = 20131213440311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20131213440311) 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, 43954614270 + ... + 43954614727.

It is an arithmetic number, because the mean of its divisors is an integer number (5054780667385).

Almost surely, 2^{20131213440313} is an apocalyptic number.

It is an amenable number.

20131213440313 is a deficient number, since it is larger than the sum of its proper divisors (87909229227).

20131213440313 is an equidigital number, since it uses as much as digits as its factorization.

20131213440313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87909229226.

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 20131213440313 its reverse (31304431213102), we get a palindrome (51435644653415).

The spelling of 20131213440313 in words is "twenty trillion, one hundred thirty-one billion, two hundred thirteen million, four hundred forty thousand, three hundred thirteen".