4005253521 has 16 divisors (see below), whose sum is σ = 5935222720. Its totient is φ = 2669487840.

The previous prime is 4005253517. The next prime is 4005253531. The reversal of 4005253521 is 1253525004.

It is a happy number.

4005253521 is a `hidden beast` number, since 40 + 0 + 52 + 53 + 521 = 666.

It is not a de Polignac number, because 4005253521 - 2² = 4005253517 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4005253531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103206 + ... + 136608.

It is an arithmetic number, because the mean of its divisors is an integer number (370951420).

Almost surely, 2^4005253521 is an apocalyptic number.

It is an amenable number.

4005253521 is a deficient number, since it is larger than the sum of its proper divisors (1929969199).

4005253521 is a wasteful number, since it uses less digits than its factorization.

4005253521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37853 (or 37847 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 4005253521 is about 63287.0723054875. The cubic root of 4005253521 is about 1588.0957016740.

Adding to 4005253521 its reverse (1253525004), we get a palindrome (5258778525).

The spelling of 4005253521 in words is "four billion, five million, two hundred fifty-three thousand, five hundred twenty-one".