43131031421 has 2 divisors, whose sum is σ = 43131031422. Its totient is φ = 43131031420.

The previous prime is 43131031327. The next prime is 43131031441. The reversal of 43131031421 is 12413013134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33384405796 + 9746625625 = 182714^2 + 98725^2 .

It is a cyclic number.

It is not a de Polignac number, because 43131031421 - 2¹⁸ = 43130769277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43131031441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21565515710 + 21565515711.

It is an arithmetic number, because the mean of its divisors is an integer number (21565515711).

Almost surely, 2^43131031421 is an apocalyptic number.

It is an amenable number.

43131031421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43131031421 is an equidigital number, since it uses as much as digits as its factorization.

43131031421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 43131031421 its reverse (12413013134), we get a palindrome (55544044555).

The spelling of 43131031421 in words is "forty-three billion, one hundred thirty-one million, thirty-one thousand, four hundred twenty-one".