4445352721 has 2 divisors, whose sum is σ = 4445352722. Its totient is φ = 4445352720.

The previous prime is 4445352683. The next prime is 4445352733. The reversal of 4445352721 is 1272535444.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2511112321 + 1934240400 = 50111^2 + 43980^2 .

It is a cyclic number.

It is not a de Polignac number, because 4445352721 - 2¹³ = 4445344529 is a prime.

It is a super-2 number, since 2×4445352721² = 39522321628204207682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4445358721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2222676360 + 2222676361.

It is an arithmetic number, because the mean of its divisors is an integer number (2222676361).

Almost surely, 2^4445352721 is an apocalyptic number.

It is an amenable number.

4445352721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4445352721 is an equidigital number, since it uses as much as digits as its factorization.

4445352721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 134400, while the sum is 37.

The square root of 4445352721 is about 66673.4783928362. The cubic root of 4445352721 is about 1644.2533753887.

The spelling of 4445352721 in words is "four billion, four hundred forty-five million, three hundred fifty-two thousand, seven hundred twenty-one".