4221289 has 4 divisors (see below), whose sum is σ = 4232020. Its totient is φ = 4210560.

The previous prime is 4221281. The next prime is 4221299. The reversal of 4221289 is 9821224.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3211264 + 1010025 = 1792^2 + 1005^2 .

It is a cyclic number.

It is not a de Polignac number, because 4221289 - 2³ = 4221281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4221281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4752 + ... + 5569.

It is an arithmetic number, because the mean of its divisors is an integer number (1058005).

Almost surely, 2^4221289 is an apocalyptic number.

It is an amenable number.

4221289 is a deficient number, since it is larger than the sum of its proper divisors (10731).

4221289 is a wasteful number, since it uses less digits than its factorization.

4221289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10730.

The product of its digits is 2304, while the sum is 28.

The square root of 4221289 is about 2054.5775721544. The cubic root of 4221289 is about 161.6150107164.

It can be divided in two parts, 422 and 1289, that added together give a triangular number (1711 = T₅₈).

The spelling of 4221289 in words is "four million, two hundred twenty-one thousand, two hundred eighty-nine".