423405121 has 2 divisors, whose sum is σ = 423405122. Its totient is φ = 423405120.

The previous prime is 423405119. The next prime is 423405127. The reversal of 423405121 is 121504324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 250114225 + 173290896 = 15815^2 + 13164^2 .

It is a cyclic number.

It is not a de Polignac number, because 423405121 - 2¹ = 423405119 is a prime.

Together with 423405119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 423405092 and 423405101.

It is not a weakly prime, because it can be changed into another prime (423405127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211702560 + 211702561.

It is an arithmetic number, because the mean of its divisors is an integer number (211702561).

Almost surely, 2^423405121 is an apocalyptic number.

It is an amenable number.

423405121 is a deficient number, since it is larger than the sum of its proper divisors (1).

423405121 is an equidigital number, since it uses as much as digits as its factorization.

423405121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 423405121 is about 20576.8102727318. The cubic root of 423405121 is about 750.9056443413.

Adding to 423405121 its reverse (121504324), we get a palindrome (544909445).

The spelling of 423405121 in words is "four hundred twenty-three million, four hundred five thousand, one hundred twenty-one".