4443723121 has 2 divisors, whose sum is σ = 4443723122. Its totient is φ = 4443723120.

The previous prime is 4443723101. The next prime is 4443723169. The reversal of 4443723121 is 1213273444.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2888525025 + 1555198096 = 53745^2 + 39436^2 .

It is a cyclic number.

It is not a de Polignac number, because 4443723121 - 2²⁵ = 4410168689 is a prime.

It is a super-2 number, since 2×4443723121² = 39493350352219961282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (4443723101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2221861560 + 2221861561.

It is an arithmetic number, because the mean of its divisors is an integer number (2221861561).

Almost surely, 2^4443723121 is an apocalyptic number.

It is an amenable number.

4443723121 is a deficient number, since it is larger than the sum of its proper divisors (1).

4443723121 is an equidigital number, since it uses as much as digits as its factorization.

4443723121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 31.

The square root of 4443723121 is about 66661.2565213108. The cubic root of 4443723121 is about 1644.0524312452.

Adding to 4443723121 its reverse (1213273444), we get a palindrome (5656996565).

The spelling of 4443723121 in words is "four billion, four hundred forty-three million, seven hundred twenty-three thousand, one hundred twenty-one".