131201221030021 has 4 divisors (see below), whose sum is σ = 131201355467200. Its totient is φ = 131201086592844.

The previous prime is 131201221029971. The next prime is 131201221030067. The reversal of 131201221030021 is 120030122102131.

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 a de Polignac number, because none of the positive numbers 2^k-131201221030021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131201221031021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65743911 + ... + 67710148.

It is an arithmetic number, because the mean of its divisors is an integer number (32800338866800).

Almost surely, 2^{131201221030021} is an apocalyptic number.

It is an amenable number.

131201221030021 is a deficient number, since it is larger than the sum of its proper divisors (134437179).

131201221030021 is an equidigital number, since it uses as much as digits as its factorization.

131201221030021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134437178.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 131201221030021 its reverse (120030122102131), we get a palindrome (251231343132152).

The spelling of 131201221030021 in words is "one hundred thirty-one trillion, two hundred one billion, two hundred twenty-one million, thirty thousand, twenty-one".