131020321021 has 4 divisors (see below), whose sum is σ = 131287165344. Its totient is φ = 130753476700.

The previous prime is 131020320989. The next prime is 131020321043. The reversal of 131020321021 is 120123020131.

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 131020321021 - 2⁵ = 131020320989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131020320986 and 131020321004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131020321321) 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, 133421425 + ... + 133422406.

It is an arithmetic number, because the mean of its divisors is an integer number (32821791336).

Almost surely, 2^131020321021 is an apocalyptic number.

It is an amenable number.

131020321021 is a deficient number, since it is larger than the sum of its proper divisors (266844323).

131020321021 is an equidigital number, since it uses as much as digits as its factorization.

131020321021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266844322.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 131020321021 its reverse (120123020131), we get a palindrome (251143341152).

The spelling of 131020321021 in words is "one hundred thirty-one billion, twenty million, three hundred twenty-one thousand, twenty-one".