421105409 has 2 divisors, whose sum is σ = 421105410. Its totient is φ = 421105408.

The previous prime is 421105339. The next prime is 421105423. The reversal of 421105409 is 904501124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 409050625 + 12054784 = 20225^2 + 3472^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421105409 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (421105499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210552704 + 210552705.

It is an arithmetic number, because the mean of its divisors is an integer number (210552705).

Almost surely, 2^421105409 is an apocalyptic number.

It is an amenable number.

421105409 is a deficient number, since it is larger than the sum of its proper divisors (1).

421105409 is an equidigital number, since it uses as much as digits as its factorization.

421105409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 421105409 is about 20520.8530280785. The cubic root of 421105409 is about 749.5436684791.

The spelling of 421105409 in words is "four hundred twenty-one million, one hundred five thousand, four hundred nine".