221426489 has 2 divisors, whose sum is σ = 221426490. Its totient is φ = 221426488.

The previous prime is 221426477. The next prime is 221426501. The reversal of 221426489 is 984624122.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (221426477) and next prime (221426501).

It can be written as a sum of positive squares in only one way, i.e., 218892025 + 2534464 = 14795^2 + 1592^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221426489 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221426419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110713244 + 110713245.

It is an arithmetic number, because the mean of its divisors is an integer number (110713245).

Almost surely, 2^221426489 is an apocalyptic number.

It is an amenable number.

221426489 is a deficient number, since it is larger than the sum of its proper divisors (1).

221426489 is an equidigital number, since it uses as much as digits as its factorization.

221426489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 38.

The square root of 221426489 is about 14880.4062108533. The cubic root of 221426489 is about 604.9830280056.

The spelling of 221426489 in words is "two hundred twenty-one million, four hundred twenty-six thousand, four hundred eighty-nine".