131021220131 has 4 divisors (see below), whose sum is σ = 131290258032. Its totient is φ = 130752182232.

The previous prime is 131021220119. The next prime is 131021220137. The reversal of 131021220131 is 131022120131.

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

It is a cyclic number.

It is not a de Polignac number, because 131021220131 - 2²² = 131017025827 is a prime.

It is a super-2 number, since 2×131021220131² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131021220137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134518220 + ... + 134519193.

It is an arithmetic number, because the mean of its divisors is an integer number (32822564508).

Almost surely, 2^131021220131 is an apocalyptic number.

131021220131 is a deficient number, since it is larger than the sum of its proper divisors (269037901).

131021220131 is an equidigital number, since it uses as much as digits as its factorization.

131021220131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269037900.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 131021220131 its reverse (131022120131), we get a palindrome (262043340262).

The spelling of 131021220131 in words is "one hundred thirty-one billion, twenty-one million, two hundred twenty thousand, one hundred thirty-one".