421128727 has 2 divisors, whose sum is σ = 421128728. Its totient is φ = 421128726.

The previous prime is 421128703. The next prime is 421128731. The reversal of 421128727 is 727821124.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421128727 - 2⁷ = 421128599 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421128692 and 421128701.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421128767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210564363 + 210564364.

It is an arithmetic number, because the mean of its divisors is an integer number (210564364).

Almost surely, 2^421128727 is an apocalyptic number.

421128727 is a deficient number, since it is larger than the sum of its proper divisors (1).

421128727 is an equidigital number, since it uses as much as digits as its factorization.

421128727 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12544, while the sum is 34.

The square root of 421128727 is about 20521.4211739831. The cubic root of 421128727 is about 749.5575031282.

The spelling of 421128727 in words is "four hundred twenty-one million, one hundred twenty-eight thousand, seven hundred twenty-seven".