224017021 has 2 divisors, whose sum is σ = 224017022. Its totient is φ = 224017020.

The previous prime is 224017009. The next prime is 224017037. The reversal of 224017021 is 120710422.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212868100 + 11148921 = 14590^2 + 3339^2 .

It is a cyclic number.

It is not a de Polignac number, because 224017021 - 2²¹ = 221919869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 224017021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (224017051) 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, 112008510 + 112008511.

It is an arithmetic number, because the mean of its divisors is an integer number (112008511).

Almost surely, 2^224017021 is an apocalyptic number.

It is an amenable number.

224017021 is a deficient number, since it is larger than the sum of its proper divisors (1).

224017021 is an equidigital number, since it uses as much as digits as its factorization.

224017021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 224017021 is about 14967.1981679939. The cubic root of 224017021 is about 607.3331766584. Note that the first 3 decimals are identical.

Adding to 224017021 its reverse (120710422), we get a palindrome (344727443).

The spelling of 224017021 in words is "two hundred twenty-four million, seventeen thousand, twenty-one".