421257827 has 2 divisors, whose sum is σ = 421257828. Its totient is φ = 421257826.

The previous prime is 421257779. The next prime is 421257899. The reversal of 421257827 is 728752124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421257827 - 2⁶ = 421257763 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (421257427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210628913 + 210628914.

It is an arithmetic number, because the mean of its divisors is an integer number (210628914).

Almost surely, 2^421257827 is an apocalyptic number.

421257827 is a deficient number, since it is larger than the sum of its proper divisors (1).

421257827 is an equidigital number, since it uses as much as digits as its factorization.

421257827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62720, while the sum is 38.

The square root of 421257827 is about 20524.5664266020. The cubic root of 421257827 is about 749.6340893601.

The spelling of 421257827 in words is "four hundred twenty-one million, two hundred fifty-seven thousand, eight hundred twenty-seven".