423031421 has 2 divisors, whose sum is σ = 423031422. Its totient is φ = 423031420.

The previous prime is 423031391. The next prime is 423031457. The reversal of 423031421 is 124130324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 332515225 + 90516196 = 18235^2 + 9514^2 .

It is a cyclic number.

It is not a de Polignac number, because 423031421 - 2²² = 418837117 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 423031393 and 423031402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423031321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211515710 + 211515711.

It is an arithmetic number, because the mean of its divisors is an integer number (211515711).

Almost surely, 2^423031421 is an apocalyptic number.

It is an amenable number.

423031421 is a deficient number, since it is larger than the sum of its proper divisors (1).

423031421 is an equidigital number, since it uses as much as digits as its factorization.

423031421 is an evil number, because the sum of its binary digits is even.

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

The square root of 423031421 is about 20567.7276576680. The cubic root of 423031421 is about 750.6846613135.

Adding to 423031421 its reverse (124130324), we get a palindrome (547161745).

The spelling of 423031421 in words is "four hundred twenty-three million, thirty-one thousand, four hundred twenty-one".