4521544021 has 2 divisors, whose sum is σ = 4521544022. Its totient is φ = 4521544020.

The previous prime is 4521543997. The next prime is 4521544037. The reversal of 4521544021 is 1204451254.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2665140625 + 1856403396 = 51625^2 + 43086^2 .

It is a cyclic number.

It is not a de Polignac number, because 4521544021 - 2¹⁷ = 4521412949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4521544051) 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, 2260772010 + 2260772011.

It is an arithmetic number, because the mean of its divisors is an integer number (2260772011).

Almost surely, 2^4521544021 is an apocalyptic number.

It is an amenable number.

4521544021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4521544021 is an equidigital number, since it uses as much as digits as its factorization.

4521544021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 4521544021 is about 67242.4272390579. The cubic root of 4521544021 is about 1653.5941269320.

Adding to 4521544021 its reverse (1204451254), we get a palindrome (5725995275).

The spelling of 4521544021 in words is "four billion, five hundred twenty-one million, five hundred forty-four thousand, twenty-one".