131243312130421 has 4 divisors (see below), whose sum is σ = 131296296917772. Its totient is φ = 131190327343072.

The previous prime is 131243312130389. The next prime is 131243312130443. The reversal of 131243312130421 is 124031213342131.

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 91250829400900 + 39992482729521 = 9552530^2 + 6323961^2 .

It is a cyclic number.

It is not a de Polignac number, because 131243312130421 - 2⁵ = 131243312130389 is a prime.

It is a super-2 number, since 2×131243312130421² (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 (131243312130221) 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, 26492389960 + ... + 26492394913.

It is an arithmetic number, because the mean of its divisors is an integer number (32824074229443).

Almost surely, 2^{131243312130421} is an apocalyptic number.

It is an amenable number.

131243312130421 is a deficient number, since it is larger than the sum of its proper divisors (52984787351).

131243312130421 is an equidigital number, since it uses as much as digits as its factorization.

131243312130421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52984787350.

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 131243312130421 its reverse (124031213342131), we get a palindrome (255274525472552).

The spelling of 131243312130421 in words is "one hundred thirty-one trillion, two hundred forty-three billion, three hundred twelve million, one hundred thirty thousand, four hundred twenty-one".