20031130121 has 4 divisors (see below), whose sum is σ = 20229458244. Its totient is φ = 19832802000.

The previous prime is 20031130051. The next prime is 20031130187. The reversal of 20031130121 is 12103113002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19506032896 + 525097225 = 139664^2 + 22915^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20031130121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20031130096 and 20031130105.

It is not an unprimeable number, because it can be changed into a prime (20031130321) 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, 99163910 + ... + 99164111.

It is an arithmetic number, because the mean of its divisors is an integer number (5057364561).

Almost surely, 2^20031130121 is an apocalyptic number.

It is an amenable number.

20031130121 is a deficient number, since it is larger than the sum of its proper divisors (198328123).

20031130121 is a wasteful number, since it uses less digits than its factorization.

20031130121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198328122.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 20031130121 its reverse (12103113002), we get a palindrome (32134243123).

The spelling of 20031130121 in words is "twenty billion, thirty-one million, one hundred thirty thousand, one hundred twenty-one".