421120489 has 2 divisors, whose sum is σ = 421120490. Its totient is φ = 421120488.

The previous prime is 421120487. The next prime is 421120589. The reversal of 421120489 is 984021124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 420250000 + 870489 = 20500^2 + 933^2 .

It is a cyclic number.

It is not a de Polignac number, because 421120489 - 2¹ = 421120487 is a prime.

Together with 421120487, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 421120489.

It is not a weakly prime, because it can be changed into another prime (421120487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210560244 + 210560245.

It is an arithmetic number, because the mean of its divisors is an integer number (210560245).

Almost surely, 2^421120489 is an apocalyptic number.

It is an amenable number.

421120489 is a deficient number, since it is larger than the sum of its proper divisors (1).

421120489 is an equidigital number, since it uses as much as digits as its factorization.

421120489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 421120489 is about 20521.2204559086. The cubic root of 421120489 is about 749.5526155530.

The spelling of 421120489 in words is "four hundred twenty-one million, one hundred twenty thousand, four hundred eighty-nine".