131001100320421 has 4 divisors (see below), whose sum is σ = 131001495237612. Its totient is φ = 131000705403232.

The previous prime is 131001100320383. The next prime is 131001100320437. The reversal of 131001100320421 is 124023001100131.

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 52721322293025 + 78279778027396 = 7260945^2 + 8847586^2 .

It is a cyclic number.

It is not a de Polignac number, because 131001100320421 - 2²³ = 131001091931813 is a prime.

It is a super-2 number, since 2×131001100320421² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131001100320481) 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, 196960600 + ... + 197624593.

It is an arithmetic number, because the mean of its divisors is an integer number (32750373809403).

Almost surely, 2^{131001100320421} is an apocalyptic number.

It is an amenable number.

131001100320421 is a deficient number, since it is larger than the sum of its proper divisors (394917191).

131001100320421 is an equidigital number, since it uses as much as digits as its factorization.

131001100320421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394917190.

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

Adding to 131001100320421 its reverse (124023001100131), we get a palindrome (255024101420552).

The spelling of 131001100320421 in words is "one hundred thirty-one trillion, one billion, one hundred million, three hundred twenty thousand, four hundred twenty-one".