426236021 has 2 divisors, whose sum is σ = 426236022. Its totient is φ = 426236020.

The previous prime is 426235993. The next prime is 426236039. The reversal of 426236021 is 120632624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 399600100 + 26635921 = 19990^2 + 5161^2 .

It is a cyclic number.

It is not a de Polignac number, because 426236021 - 2¹⁰ = 426234997 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426236051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213118010 + 213118011.

It is an arithmetic number, because the mean of its divisors is an integer number (213118011).

Almost surely, 2^426236021 is an apocalyptic number.

It is an amenable number.

426236021 is a deficient number, since it is larger than the sum of its proper divisors (1).

426236021 is an equidigital number, since it uses as much as digits as its factorization.

426236021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 426236021 is about 20645.4842762285. The cubic root of 426236021 is about 752.5754546619.

Adding to 426236021 its reverse (120632624), we get a palindrome (546868645).

The spelling of 426236021 in words is "four hundred twenty-six million, two hundred thirty-six thousand, twenty-one".