421071841 has 2 divisors, whose sum is σ = 421071842. Its totient is φ = 421071840.

The previous prime is 421071839. The next prime is 421071899. The reversal of 421071841 is 148170124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 381381841 + 39690000 = 19529^2 + 6300^2 .

It is a cyclic number.

It is not a de Polignac number, because 421071841 - 2¹ = 421071839 is a prime.

Together with 421071839, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (421071821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210535920 + 210535921.

It is an arithmetic number, because the mean of its divisors is an integer number (210535921).

Almost surely, 2^421071841 is an apocalyptic number.

It is an amenable number.

421071841 is a deficient number, since it is larger than the sum of its proper divisors (1).

421071841 is an equidigital number, since it uses as much as digits as its factorization.

421071841 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 421071841 is about 20520.0351120557. The cubic root of 421071841 is about 749.5237515732.

The spelling of 421071841 in words is "four hundred twenty-one million, seventy-one thousand, eight hundred forty-one".