20131312211 has 4 divisors (see below), whose sum is σ = 20178021024. Its totient is φ = 20084603400.

The previous prime is 20131312169. The next prime is 20131312261. The reversal of 20131312211 is 11221313102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20131312211 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20131312211.

It is not an unprimeable number, because it can be changed into a prime (20131312261) 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, 23353760 + ... + 23354621.

It is an arithmetic number, because the mean of its divisors is an integer number (5044505256).

Almost surely, 2^20131312211 is an apocalyptic number.

20131312211 is a deficient number, since it is larger than the sum of its proper divisors (46708813).

20131312211 is an equidigital number, since it uses as much as digits as its factorization.

20131312211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46708812.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 20131312211 its reverse (11221313102), we get a palindrome (31352625313).

The spelling of 20131312211 in words is "twenty billion, one hundred thirty-one million, three hundred twelve thousand, two hundred eleven".