4385535721 has 24 divisors (see below), whose sum is σ = 5205907584. Its totient is φ = 3682355040.

The previous prime is 4385535703. The next prime is 4385535727. The reversal of 4385535721 is 1275355834.

It is not a de Polignac number, because 4385535721 - 2²⁵ = 4351981289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4385535727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2863726 + ... + 2865256.

It is an arithmetic number, because the mean of its divisors is an integer number (216912816).

Almost surely, 2^4385535721 is an apocalyptic number.

It is an amenable number.

4385535721 is a deficient number, since it is larger than the sum of its proper divisors (820371863).

4385535721 is a wasteful number, since it uses less digits than its factorization.

4385535721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2701 (or 2694 counting only the distinct ones).

The product of its digits is 504000, while the sum is 43.

The square root of 4385535721 is about 66223.3774508670. The cubic root of 4385535721 is about 1636.8449804177.

The spelling of 4385535721 in words is "four billion, three hundred eighty-five million, five hundred thirty-five thousand, seven hundred twenty-one".