421019 has 2 divisors, whose sum is σ = 421020. Its totient is φ = 421018.

The previous prime is 421009. The next prime is 421033. The reversal of 421019 is 910124.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421019 - 2¹⁶ = 355483 is a prime.

It is a super-2 number, since 2×421019² = 354513996722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 420988 and 421006.

It is not a weakly prime, because it can be changed into another prime (421009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210509 + 210510.

It is an arithmetic number, because the mean of its divisors is an integer number (210510).

2⁴²¹⁰¹⁹ is an apocalyptic number.

421019 is a deficient number, since it is larger than the sum of its proper divisors (1).

421019 is an equidigital number, since it uses as much as digits as its factorization.

421019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 421019 is about 648.8597691335. The cubic root of 421019 is about 74.9492397271.

The spelling of 421019 in words is "four hundred twenty-one thousand, nineteen".