20012131001 has 4 divisors (see below), whose sum is σ = 20012726400. Its totient is φ = 20011535604.

The previous prime is 20012130989. The next prime is 20012131031. The reversal of 20012131001 is 10013121002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20012131001 - 2³⁰ = 18938389177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20012131031) 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, 244061 + ... + 315578.

It is an arithmetic number, because the mean of its divisors is an integer number (5003181600).

Almost surely, 2^20012131001 is an apocalyptic number.

It is an amenable number.

20012131001 is a deficient number, since it is larger than the sum of its proper divisors (595399).

20012131001 is an equidigital number, since it uses as much as digits as its factorization.

20012131001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595398.

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

Adding to 20012131001 its reverse (10013121002), we get a palindrome (30025252003).

Subtracting from 20012131001 its reverse (10013121002), we obtain a palindrome (9999009999).

The spelling of 20012131001 in words is "twenty billion, twelve million, one hundred thirty-one thousand, one".