20131140121 has 4 divisors (see below), whose sum is σ = 21315324852. Its totient is φ = 18946955392.

The previous prime is 20131140109. The next prime is 20131140187. The reversal of 20131140121 is 12104113102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12104113102 = 2 ⋅6052056551.

It can be written as a sum of positive squares in 2 ways, for example, as 10748505625 + 9382634496 = 103675^2 + 96864^2 .

It is a cyclic number.

It is not a de Polignac number, because 20131140121 - 2⁵ = 20131140089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20131140095 and 20131140104.

It is not an unprimeable number, because it can be changed into a prime (20131146121) 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, 592092340 + ... + 592092373.

It is an arithmetic number, because the mean of its divisors is an integer number (5328831213).

Almost surely, 2^20131140121 is an apocalyptic number.

It is an amenable number.

20131140121 is a deficient number, since it is larger than the sum of its proper divisors (1184184731).

20131140121 is a wasteful number, since it uses less digits than its factorization.

20131140121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184184730.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 20131140121 its reverse (12104113102), we get a palindrome (32235253223).

The spelling of 20131140121 in words is "twenty billion, one hundred thirty-one million, one hundred forty thousand, one hundred twenty-one".