420412021 has 2 divisors, whose sum is σ = 420412022. Its totient is φ = 420412020.

The previous prime is 420411973. The next prime is 420412051. The reversal of 420412021 is 120214024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 320911396 + 99500625 = 17914^2 + 9975^2 .

It is a cyclic number.

It is not a de Polignac number, because 420412021 - 2¹¹ = 420409973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 420411986 and 420412004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420412051) 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, 210206010 + 210206011.

It is an arithmetic number, because the mean of its divisors is an integer number (210206011).

Almost surely, 2^420412021 is an apocalyptic number.

It is an amenable number.

420412021 is a deficient number, since it is larger than the sum of its proper divisors (1).

420412021 is an equidigital number, since it uses as much as digits as its factorization.

420412021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 420412021 is about 20503.9513508982. The cubic root of 420412021 is about 749.1320454087.

Adding to 420412021 its reverse (120214024), we get a palindrome (540626045).

The spelling of 420412021 in words is "four hundred twenty million, four hundred twelve thousand, twenty-one".