426323021 has 2 divisors, whose sum is σ = 426323022. Its totient is φ = 426323020.

The previous prime is 426323017. The next prime is 426323063. The reversal of 426323021 is 120323624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 349129225 + 77193796 = 18685^2 + 8786^2 .

It is a cyclic number.

It is not a de Polignac number, because 426323021 - 2² = 426323017 is a prime.

It is a Chen prime.

It is equal to p_22663112 and since 426323021 and 22663112 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426323071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213161510 + 213161511.

It is an arithmetic number, because the mean of its divisors is an integer number (213161511).

Almost surely, 2^426323021 is an apocalyptic number.

It is an amenable number.

426323021 is a deficient number, since it is larger than the sum of its proper divisors (1).

426323021 is an equidigital number, since it uses as much as digits as its factorization.

426323021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 23.

The square root of 426323021 is about 20647.5911670103. The cubic root of 426323021 is about 752.6266544723.

Adding to 426323021 its reverse (120323624), we get a palindrome (546646645).

The spelling of 426323021 in words is "four hundred twenty-six million, three hundred twenty-three thousand, twenty-one".