20112113231 has 4 divisors (see below), whose sum is σ = 22985272272. Its totient is φ = 17238954192.

The previous prime is 20112113183. The next prime is 20112113233. The reversal of 20112113231 is 13231121102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13231121102 = 2 ⋅6615560551.

It is a cyclic number.

It is not a de Polignac number, because 20112113231 - 2⁶ = 20112113167 is a prime.

It is a super-2 number, since 2×20112113231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112113233) 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, 1436579510 + ... + 1436579523.

It is an arithmetic number, because the mean of its divisors is an integer number (5746318068).

Almost surely, 2^20112113231 is an apocalyptic number.

20112113231 is a deficient number, since it is larger than the sum of its proper divisors (2873159041).

20112113231 is an equidigital number, since it uses as much as digits as its factorization.

20112113231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2873159040.

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

Adding to 20112113231 its reverse (13231121102), we get a palindrome (33343234333).

The spelling of 20112113231 in words is "twenty billion, one hundred twelve million, one hundred thirteen thousand, two hundred thirty-one".