221144479 has 2 divisors, whose sum is σ = 221144480. Its totient is φ = 221144478.

The previous prime is 221144437. The next prime is 221144489. The reversal of 221144479 is 974441122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221144479 - 2¹¹ = 221142431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221144419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110572239 + 110572240.

It is an arithmetic number, because the mean of its divisors is an integer number (110572240).

Almost surely, 2^221144479 is an apocalyptic number.

221144479 is a deficient number, since it is larger than the sum of its proper divisors (1).

221144479 is an equidigital number, since it uses as much as digits as its factorization.

221144479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 34.

The square root of 221144479 is about 14870.9273080060. The cubic root of 221144479 is about 604.7260823163.

The spelling of 221144479 in words is "two hundred twenty-one million, one hundred forty-four thousand, four hundred seventy-nine".