421043407 has 2 divisors, whose sum is σ = 421043408. Its totient is φ = 421043406.

The previous prime is 421043383. The next prime is 421043429. The reversal of 421043407 is 704340124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421043407 - 2⁷ = 421043279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421043107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210521703 + 210521704.

It is an arithmetic number, because the mean of its divisors is an integer number (210521704).

Almost surely, 2^421043407 is an apocalyptic number.

421043407 is a deficient number, since it is larger than the sum of its proper divisors (1).

421043407 is an equidigital number, since it uses as much as digits as its factorization.

421043407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 421043407 is about 20519.3422652872. The cubic root of 421043407 is about 749.5068799961.

The spelling of 421043407 in words is "four hundred twenty-one million, forty-three thousand, four hundred seven".