20112131443231 has 4 divisors (see below), whose sum is σ = 20122880847264. Its totient is φ = 20101382039200.

The previous prime is 20112131443171. The next prime is 20112131443249. The reversal of 20112131443231 is 13234413121102.

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

It is a cyclic number.

It is not a de Polignac number, because 20112131443231 - 2⁹ = 20112131442719 is a prime.

It is a super-2 number, since 2×20112131443231² (a number of 27 digits) contains 22 as substring.

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 20112131443231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112131443291) 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, 5374699210 + ... + 5374702951.

It is an arithmetic number, because the mean of its divisors is an integer number (5030720211816).

Almost surely, 2^{20112131443231} is an apocalyptic number.

20112131443231 is a deficient number, since it is larger than the sum of its proper divisors (10749404033).

20112131443231 is a wasteful number, since it uses less digits than its factorization.

20112131443231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10749404032.

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 20112131443231 its reverse (13234413121102), we get a palindrome (33346544564333).

The spelling of 20112131443231 in words is "twenty trillion, one hundred twelve billion, one hundred thirty-one million, four hundred forty-three thousand, two hundred thirty-one".