4221446521 has 2 divisors, whose sum is σ = 4221446522. Its totient is φ = 4221446520.

The previous prime is 4221446507. The next prime is 4221446539. The reversal of 4221446521 is 1256441224.

4221446521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3010058496 + 1211388025 = 54864^2 + 34805^2 .

It is a cyclic number.

It is not a de Polignac number, because 4221446521 - 2³¹ = 2073962873 is a prime.

It is a super-2 number, since 2×4221446521² = 35641221459326006882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4221446821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2110723260 + 2110723261.

It is an arithmetic number, because the mean of its divisors is an integer number (2110723261).

Almost surely, 2^4221446521 is an apocalyptic number.

It is an amenable number.

4221446521 is a deficient number, since it is larger than the sum of its proper divisors (1).

4221446521 is an equidigital number, since it uses as much as digits as its factorization.

4221446521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15360, while the sum is 31.

The square root of 4221446521 is about 64972.6597962558. The cubic root of 4221446521 is about 1616.1702095871.

Adding to 4221446521 its reverse (1256441224), we get a palindrome (5477887745).

The spelling of 4221446521 in words is "four billion, two hundred twenty-one million, four hundred forty-six thousand, five hundred twenty-one".