824019221 has 2 divisors, whose sum is σ = 824019222. Its totient is φ = 824019220.

The previous prime is 824019211. The next prime is 824019233. The reversal of 824019221 is 122910428.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 811452196 + 12567025 = 28486^2 + 3545^2 .

It is a cyclic number.

It is not a de Polignac number, because 824019221 - 2²² = 819824917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (824019211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412009610 + 412009611.

It is an arithmetic number, because the mean of its divisors is an integer number (412009611).

Almost surely, 2^824019221 is an apocalyptic number.

It is an amenable number.

824019221 is a deficient number, since it is larger than the sum of its proper divisors (1).

824019221 is an equidigital number, since it uses as much as digits as its factorization.

824019221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 824019221 is about 28705.7349844940. The cubic root of 824019221 is about 937.5169190665.

Adding to 824019221 its reverse (122910428), we get a palindrome (946929649).

The spelling of 824019221 in words is "eight hundred twenty-four million, nineteen thousand, two hundred twenty-one".