421403417 has 2 divisors, whose sum is σ = 421403418. Its totient is φ = 421403416.

The previous prime is 421403357. The next prime is 421403431. The reversal of 421403417 is 714304124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 293916736 + 127486681 = 17144^2 + 11291^2 .

It is a cyclic number.

It is not a de Polignac number, because 421403417 - 2⁸ = 421403161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (421403467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210701708 + 210701709.

It is an arithmetic number, because the mean of its divisors is an integer number (210701709).

Almost surely, 2^421403417 is an apocalyptic number.

It is an amenable number.

421403417 is a deficient number, since it is larger than the sum of its proper divisors (1).

421403417 is an equidigital number, since it uses as much as digits as its factorization.

421403417 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 421403417 is about 20528.1128455589. The cubic root of 421403417 is about 749.7204392147.

The spelling of 421403417 in words is "four hundred twenty-one million, four hundred three thousand, four hundred seventeen".