431023004021 has 2 divisors, whose sum is σ = 431023004022. Its totient is φ = 431023004020.

The previous prime is 431023004017. The next prime is 431023004029. The reversal of 431023004021 is 120400320134.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 245184415921 + 185838588100 = 495161^2 + 431090^2 .

It is a cyclic number.

It is not a de Polignac number, because 431023004021 - 2² = 431023004017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 431023003984 and 431023004002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431023004029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215511502010 + 215511502011.

It is an arithmetic number, because the mean of its divisors is an integer number (215511502011).

Almost surely, 2^431023004021 is an apocalyptic number.

It is an amenable number.

431023004021 is a deficient number, since it is larger than the sum of its proper divisors (1).

431023004021 is an equidigital number, since it uses as much as digits as its factorization.

431023004021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 431023004021 its reverse (120400320134), we get a palindrome (551423324155).

The spelling of 431023004021 in words is "four hundred thirty-one billion, twenty-three million, four thousand, twenty-one".