421421017 has 2 divisors, whose sum is σ = 421421018. Its totient is φ = 421421016.

The previous prime is 421420903. The next prime is 421421029. The reversal of 421421017 is 710124124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 341658256 + 79762761 = 18484^2 + 8931^2 .

It is a cyclic number.

It is not a de Polignac number, because 421421017 - 2¹⁵ = 421388249 is a prime.

It is not a weakly prime, because it can be changed into another prime (421421047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210710508 + 210710509.

It is an arithmetic number, because the mean of its divisors is an integer number (210710509).

Almost surely, 2^421421017 is an apocalyptic number.

It is an amenable number.

421421017 is a deficient number, since it is larger than the sum of its proper divisors (1).

421421017 is an equidigital number, since it uses as much as digits as its factorization.

421421017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 421421017 is about 20528.5415215012. The cubic root of 421421017 is about 749.7308764786.

The spelling of 421421017 in words is "four hundred twenty-one million, four hundred twenty-one thousand, seventeen".