20112321123131 has 4 divisors (see below), whose sum is σ = 20270685856512. Its totient is φ = 19953956389752.

The previous prime is 20112321123079. The next prime is 20112321123143. The reversal of 20112321123131 is 13132112321102.

It is a happy number.

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 20112321123131 - 2³⁰ = 20111247381307 is a prime.

It is a super-2 number, since 2×20112321123131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20112321123097 and 20112321123106.

It is not an unprimeable number, because it can be changed into a prime (20112321123161) 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, 79182366500 + ... + 79182366753.

It is an arithmetic number, because the mean of its divisors is an integer number (5067671464128).

Almost surely, 2^{20112321123131} is an apocalyptic number.

20112321123131 is a deficient number, since it is larger than the sum of its proper divisors (158364733381).

20112321123131 is a wasteful number, since it uses less digits than its factorization.

20112321123131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158364733380.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 20112321123131 its reverse (13132112321102), we get a palindrome (33244433444233).

The spelling of 20112321123131 in words is "twenty trillion, one hundred twelve billion, three hundred twenty-one million, one hundred twenty-three thousand, one hundred thirty-one".