20000131121 has 4 divisors (see below), whose sum is σ = 20001067044. Its totient is φ = 19999195200.

The previous prime is 20000131103. The next prime is 20000131141. The reversal of 20000131121 is 12113100002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12113100002 = 2 ⋅6056550001.

It can be written as a sum of positive squares in 2 ways, for example, as 242736400 + 19757394721 = 15580^2 + 140561^2 .

It is a cyclic number.

It is not a de Polignac number, because 20000131121 - 2¹⁴ = 20000114737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20000131141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 435140 + ... + 478901.

It is an arithmetic number, because the mean of its divisors is an integer number (5000266761).

Almost surely, 2^20000131121 is an apocalyptic number.

It is an amenable number.

20000131121 is a deficient number, since it is larger than the sum of its proper divisors (935923).

20000131121 is an equidigital number, since it uses as much as digits as its factorization.

20000131121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935922.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 20000131121 its reverse (12113100002), we get a palindrome (32113231123).

The spelling of 20000131121 in words is "twenty billion, one hundred thirty-one thousand, one hundred twenty-one".