421405307 has 2 divisors, whose sum is σ = 421405308. Its totient is φ = 421405306.

The previous prime is 421405291. The next prime is 421405331. The reversal of 421405307 is 703504124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421405307 - 2⁴ = 421405291 is a prime.

It is not a weakly prime, because it can be changed into another prime (421401307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210702653 + 210702654.

It is an arithmetic number, because the mean of its divisors is an integer number (210702654).

Almost surely, 2^421405307 is an apocalyptic number.

421405307 is a deficient number, since it is larger than the sum of its proper divisors (1).

421405307 is an equidigital number, since it uses as much as digits as its factorization.

421405307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 421405307 is about 20528.1588799386. The cubic root of 421405307 is about 749.7215600485.

The spelling of 421405307 in words is "four hundred twenty-one million, four hundred five thousand, three hundred seven".