20431113112211 has 2 divisors, whose sum is σ = 20431113112212. Its totient is φ = 20431113112210.

The previous prime is 20431113112177. The next prime is 20431113112213. The reversal of 20431113112211 is 11221131113402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20431113112211 - 2²² = 20431108917907 is a prime.

It is a Sophie Germain prime.

Together with 20431113112213, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20431113112213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10215556556105 + 10215556556106.

It is an arithmetic number, because the mean of its divisors is an integer number (10215556556106).

Almost surely, 2^{20431113112211} is an apocalyptic number.

20431113112211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20431113112211 is an equidigital number, since it uses as much as digits as its factorization.

20431113112211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

Adding to 20431113112211 its reverse (11221131113402), we get a palindrome (31652244225613).

The spelling of 20431113112211 in words is "twenty trillion, four hundred thirty-one billion, one hundred thirteen million, one hundred twelve thousand, two hundred eleven".