450042421 has 2 divisors, whose sum is σ = 450042422. Its totient is φ = 450042420.

The previous prime is 450042391. The next prime is 450042443. The reversal of 450042421 is 124240054.

It is a happy number.

It is an a-pointer prime, because the next prime (450042443) can be obtained adding 450042421 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 445674321 + 4368100 = 21111^2 + 2090^2 .

It is a cyclic number.

It is not a de Polignac number, because 450042421 - 2⁷ = 450042293 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 450042392 and 450042401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (450042821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225021210 + 225021211.

It is an arithmetic number, because the mean of its divisors is an integer number (225021211).

Almost surely, 2^450042421 is an apocalyptic number.

It is an amenable number.

450042421 is a deficient number, since it is larger than the sum of its proper divisors (1).

450042421 is an equidigital number, since it uses as much as digits as its factorization.

450042421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 450042421 is about 21214.2032845921. The cubic root of 450042421 is about 766.3335113498. Note that the first 3 decimals are identical.

Adding to 450042421 its reverse (124240054), we get a palindrome (574282475).

The spelling of 450042421 in words is "four hundred fifty million, forty-two thousand, four hundred twenty-one".