4420436521 has 2 divisors, whose sum is σ = 4420436522. Its totient is φ = 4420436520.

The previous prime is 4420436519. The next prime is 4420436533. The reversal of 4420436521 is 1256340244.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3010058496 + 1410378025 = 54864^2 + 37555^2 .

It is a cyclic number.

It is not a de Polignac number, because 4420436521 - 2¹ = 4420436519 is a prime.

Together with 4420436519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (4420436561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2210218260 + 2210218261.

It is an arithmetic number, because the mean of its divisors is an integer number (2210218261).

Almost surely, 2^4420436521 is an apocalyptic number.

It is an amenable number.

4420436521 is a deficient number, since it is larger than the sum of its proper divisors (1).

4420436521 is an equidigital number, since it uses as much as digits as its factorization.

4420436521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 31.

The square root of 4420436521 is about 66486.3634213814. The cubic root of 4420436521 is about 1641.1756047623.

Adding to 4420436521 its reverse (1256340244), we get a palindrome (5676776765).

The spelling of 4420436521 in words is "four billion, four hundred twenty million, four hundred thirty-six thousand, five hundred twenty-one".