423440012204021 has 2 divisors, whose sum is σ = 423440012204022. Its totient is φ = 423440012204020.

The previous prime is 423440012203969. The next prime is 423440012204081. The reversal of 423440012204021 is 120402210044324.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 422956695259921 + 483316944100 = 20565911^2 + 695210^2 .

It is a cyclic number.

It is not a de Polignac number, because 423440012204021 - 2³⁸ = 423165134297077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423440012204081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211720006102010 + 211720006102011.

It is an arithmetic number, because the mean of its divisors is an integer number (211720006102011).

Almost surely, 2^{423440012204021} is an apocalyptic number.

It is an amenable number.

423440012204021 is a deficient number, since it is larger than the sum of its proper divisors (1).

423440012204021 is an equidigital number, since it uses as much as digits as its factorization.

423440012204021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 423440012204021 its reverse (120402210044324), we get a palindrome (543842222248345).

The spelling of 423440012204021 in words is "four hundred twenty-three trillion, four hundred forty billion, twelve million, two hundred four thousand, twenty-one".