20131312231111 has 8 divisors (see below), whose sum is σ = 20431903101680. Its totient is φ = 19830724993728.

The previous prime is 20131312231099. The next prime is 20131312231117. The reversal of 20131312231111 is 11113221313102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20131312231111 - 2¹⁵ = 20131312198343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131312231117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11515585 + ... + 13148053.

It is an arithmetic number, because the mean of its divisors is an integer number (2553987887710).

Almost surely, 2^{20131312231111} is an apocalyptic number.

20131312231111 is a deficient number, since it is larger than the sum of its proper divisors (300590870569).

20131312231111 is a wasteful number, since it uses less digits than its factorization.

20131312231111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1816593.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 20131312231111 its reverse (11113221313102), we get a palindrome (31244533544213).

The spelling of 20131312231111 in words is "twenty trillion, one hundred thirty-one billion, three hundred twelve million, two hundred thirty-one thousand, one hundred eleven".