426670021 has 2 divisors, whose sum is σ = 426670022. Its totient is φ = 426670020.

The previous prime is 426670007. The next prime is 426670031. The reversal of 426670021 is 120076624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 318801025 + 107868996 = 17855^2 + 10386^2 .

It is a cyclic number.

It is not a de Polignac number, because 426670021 - 2⁵ = 426669989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426670031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213335010 + 213335011.

It is an arithmetic number, because the mean of its divisors is an integer number (213335011).

Almost surely, 2^426670021 is an apocalyptic number.

It is an amenable number.

426670021 is a deficient number, since it is larger than the sum of its proper divisors (1).

426670021 is an equidigital number, since it uses as much as digits as its factorization.

426670021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 426670021 is about 20655.9923750954. The cubic root of 426670021 is about 752.8307959425.

The spelling of 426670021 in words is "four hundred twenty-six million, six hundred seventy thousand, twenty-one".