421104989 has 2 divisors, whose sum is σ = 421104990. Its totient is φ = 421104988.

The previous prime is 421104967. The next prime is 421104991. The reversal of 421104989 is 989401124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 420660100 + 444889 = 20510^2 + 667^2 .

It is a cyclic number.

It is not a de Polignac number, because 421104989 - 2¹⁶ = 421039453 is a prime.

Together with 421104991, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421104689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210552494 + 210552495.

It is an arithmetic number, because the mean of its divisors is an integer number (210552495).

Almost surely, 2^421104989 is an apocalyptic number.

It is an amenable number.

421104989 is a deficient number, since it is larger than the sum of its proper divisors (1).

421104989 is an equidigital number, since it uses as much as digits as its factorization.

421104989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 421104989 is about 20520.8427945833. The cubic root of 421104989 is about 749.5434192870.

The spelling of 421104989 in words is "four hundred twenty-one million, one hundred four thousand, nine hundred eighty-nine".