221342489 has 2 divisors, whose sum is σ = 221342490. Its totient is φ = 221342488.

The previous prime is 221342389. The next prime is 221342519. The reversal of 221342489 is 984243122.

221342489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216590089 + 4752400 = 14717^2 + 2180^2 .

It is a cyclic number.

It is not a de Polignac number, because 221342489 - 2¹⁶ = 221276953 is a prime.

It is not a weakly prime, because it can be changed into another prime (221342389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110671244 + 110671245.

It is an arithmetic number, because the mean of its divisors is an integer number (110671245).

Almost surely, 2^221342489 is an apocalyptic number.

It is an amenable number.

221342489 is a deficient number, since it is larger than the sum of its proper divisors (1).

221342489 is an equidigital number, since it uses as much as digits as its factorization.

221342489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 35.

The square root of 221342489 is about 14877.5834395240. The cubic root of 221342489 is about 604.9065165305.

The spelling of 221342489 in words is "two hundred twenty-one million, three hundred forty-two thousand, four hundred eighty-nine".