7424433721 has 2 divisors, whose sum is σ = 7424433722. Its totient is φ = 7424433720.

The previous prime is 7424433713. The next prime is 7424433761. The reversal of 7424433721 is 1273344247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7319658025 + 104775696 = 85555^2 + 10236^2 .

It is a cyclic number.

It is not a de Polignac number, because 7424433721 - 2³ = 7424433713 is a prime.

It is not a weakly prime, because it can be changed into another prime (7424433761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3712216860 + 3712216861.

It is an arithmetic number, because the mean of its divisors is an integer number (3712216861).

Almost surely, 2^7424433721 is an apocalyptic number.

It is an amenable number.

7424433721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7424433721 is an equidigital number, since it uses as much as digits as its factorization.

7424433721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 112896, while the sum is 37.

The square root of 7424433721 is about 86165.1537513861. The cubic root of 7424433721 is about 1950.8375732166.

Adding to 7424433721 its reverse (1273344247), we get a palindrome (8697777968).

The spelling of 7424433721 in words is "seven billion, four hundred twenty-four million, four hundred thirty-three thousand, seven hundred twenty-one".