426402044021 has 2 divisors, whose sum is σ = 426402044022. Its totient is φ = 426402044020.

The previous prime is 426402043997. The next prime is 426402044063. The reversal of 426402044021 is 120440204624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 315405792100 + 110996251921 = 561610^2 + 333161^2 .

It is a cyclic number.

It is not a de Polignac number, because 426402044021 - 2¹⁴ = 426402027637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426402044221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213201022010 + 213201022011.

It is an arithmetic number, because the mean of its divisors is an integer number (213201022011).

Almost surely, 2^426402044021 is an apocalyptic number.

It is an amenable number.

426402044021 is a deficient number, since it is larger than the sum of its proper divisors (1).

426402044021 is an equidigital number, since it uses as much as digits as its factorization.

426402044021 is an evil number, because the sum of its binary digits is even.

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

Adding to 426402044021 its reverse (120440204624), we get a palindrome (546842248645).

The spelling of 426402044021 in words is "four hundred twenty-six billion, four hundred two million, forty-four thousand, twenty-one".