131440407421 has 2 divisors, whose sum is σ = 131440407422. Its totient is φ = 131440407420.

The previous prime is 131440407403. The next prime is 131440407443. The reversal of 131440407421 is 124704044131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129032542521 + 2407864900 = 359211^2 + 49070^2 .

It is a cyclic number.

It is not a de Polignac number, because 131440407421 - 2¹¹ = 131440405373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131440407481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65720203710 + 65720203711.

It is an arithmetic number, because the mean of its divisors is an integer number (65720203711).

Almost surely, 2^131440407421 is an apocalyptic number.

It is an amenable number.

131440407421 is a deficient number, since it is larger than the sum of its proper divisors (1).

131440407421 is an equidigital number, since it uses as much as digits as its factorization.

131440407421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10752, while the sum is 31.

The spelling of 131440407421 in words is "one hundred thirty-one billion, four hundred forty million, four hundred seven thousand, four hundred twenty-one".