423341233220021 has 2 divisors, whose sum is σ = 423341233220022. Its totient is φ = 423341233220020.

The previous prime is 423341233220011. The next prime is 423341233220063. The reversal of 423341233220021 is 120022332143324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 255855860295025 + 167485372924996 = 15995495^2 + 12941614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-423341233220021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 423341233220021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423341233220011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211670616610010 + 211670616610011.

It is an arithmetic number, because the mean of its divisors is an integer number (211670616610011).

Almost surely, 2^{423341233220021} is an apocalyptic number.

It is an amenable number.

423341233220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

423341233220021 is an equidigital number, since it uses as much as digits as its factorization.

423341233220021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 32.

Adding to 423341233220021 its reverse (120022332143324), we get a palindrome (543363565363345).

The spelling of 423341233220021 in words is "four hundred twenty-three trillion, three hundred forty-one billion, two hundred thirty-three million, two hundred twenty thousand, twenty-one".