4223726721 has 64 divisors (see below), whose sum is σ = 6984403200. Its totient is φ = 2510097408.

The previous prime is 4223726711. The next prime is 4223726743. The reversal of 4223726721 is 1276273224.

It is a happy number.

4223726721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 4223726721 - 2⁹ = 4223726209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4223726711) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 702490 + ... + 708476.

It is an arithmetic number, because the mean of its divisors is an integer number (109131300).

Almost surely, 2^4223726721 is an apocalyptic number.

It is an amenable number.

4223726721 is a deficient number, since it is larger than the sum of its proper divisors (2760676479).

4223726721 is a wasteful number, since it uses less digits than its factorization.

4223726721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6095 (or 6089 counting only the distinct ones).

The product of its digits is 56448, while the sum is 36.

The square root of 4223726721 is about 64990.2048081094. The cubic root of 4223726721 is about 1616.4611468269.

Adding to 4223726721 its reverse (1276273224), we get a palindrome (5499999945).

The spelling of 4223726721 in words is "four billion, two hundred twenty-three million, seven hundred twenty-six thousand, seven hundred twenty-one".