421070987 has 2 divisors, whose sum is σ = 421070988. Its totient is φ = 421070986.

The previous prime is 421070963. The next prime is 421071019. The reversal of 421070987 is 789070124.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421070987 - 2¹⁴ = 421054603 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421070987.

It is not a weakly prime, because it can be changed into another prime (421070927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210535493 + 210535494.

It is an arithmetic number, because the mean of its divisors is an integer number (210535494).

Almost surely, 2^421070987 is an apocalyptic number.

421070987 is a deficient number, since it is larger than the sum of its proper divisors (1).

421070987 is an equidigital number, since it uses as much as digits as its factorization.

421070987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 421070987 is about 20520.0143031139. The cubic root of 421070987 is about 749.5232448554.

The spelling of 421070987 in words is "four hundred twenty-one million, seventy thousand, nine hundred eighty-seven".