4400224021 has 2 divisors, whose sum is σ = 4400224022. Its totient is φ = 4400224020.

The previous prime is 4400223983. The next prime is 4400224039. The reversal of 4400224021 is 1204220044.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3067608996 + 1332615025 = 55386^2 + 36505^2 .

It is a cyclic number.

It is not a de Polignac number, because 4400224021 - 2¹³ = 4400215829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4400224021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4400225021) 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, 2200112010 + 2200112011.

It is an arithmetic number, because the mean of its divisors is an integer number (2200112011).

Almost surely, 2^4400224021 is an apocalyptic number.

It is an amenable number.

4400224021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4400224021 is an equidigital number, since it uses as much as digits as its factorization.

4400224021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 4400224021 is about 66334.1844074381. The cubic root of 4400224021 is about 1638.6703506036.

Adding to 4400224021 its reverse (1204220044), we get a palindrome (5604444065).

The spelling of 4400224021 in words is "four billion, four hundred million, two hundred twenty-four thousand, twenty-one".