4005444221 has 4 divisors (see below), whose sum is σ = 4026198012. Its totient is φ = 3984690432.

The previous prime is 4005444193. The next prime is 4005444241. The reversal of 4005444221 is 1224445004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 363321721 + 3642122500 = 19061^2 + 60350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4005444221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4005444241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10376606 + ... + 10376991.

It is an arithmetic number, because the mean of its divisors is an integer number (1006549503).

Almost surely, 2^4005444221 is an apocalyptic number.

It is an amenable number.

4005444221 is a deficient number, since it is larger than the sum of its proper divisors (20753791).

4005444221 is a wasteful number, since it uses less digits than its factorization.

4005444221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20753790.

The product of its (nonzero) digits is 5120, while the sum is 26.

The square root of 4005444221 is about 63288.5789143665. The cubic root of 4005444221 is about 1588.1209056586.

Adding to 4005444221 its reverse (1224445004), we get a palindrome (5229889225).

The spelling of 4005444221 in words is "four billion, five million, four hundred forty-four thousand, two hundred twenty-one".