4005523221 has 16 divisors (see below), whose sum is σ = 6462693504. Its totient is φ = 2154230784.

The previous prime is 4005523169. The next prime is 4005523273. The reversal of 4005523221 is 1223255004.

4005523221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (4005523169) and next prime (4005523273).

It is not a de Polignac number, because 4005523221 - 2¹³ = 4005515029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4005523191 and 4005523200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4005523021) 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, 5609620 + ... + 5610333.

It is an arithmetic number, because the mean of its divisors is an integer number (403918344).

Almost surely, 2^4005523221 is an apocalyptic number.

It is an amenable number.

4005523221 is a deficient number, since it is larger than the sum of its proper divisors (2457170283).

4005523221 is a wasteful number, since it uses less digits than its factorization.

4005523221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11219980.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 4005523221 is about 63289.2030365370. The cubic root of 4005523221 is about 1588.1313465086.

Adding to 4005523221 its reverse (1223255004), we get a palindrome (5228778225).

The spelling of 4005523221 in words is "four billion, five million, five hundred twenty-three thousand, two hundred twenty-one".