40004000221 has 4 divisors (see below), whose sum is σ = 40758792732. Its totient is φ = 39249207712.

The previous prime is 40004000203. The next prime is 40004000249. The reversal of 40004000221 is 12200040004.

40004000221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 28836794596 + 11167205625 = 169814^2 + 105675^2 .

It is a cyclic number.

It is not a de Polignac number, because 40004000221 - 2⁷ = 40004000093 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 (40004007221) 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, 377396176 + ... + 377396281.

It is an arithmetic number, because the mean of its divisors is an integer number (10189698183).

Almost surely, 2^40004000221 is an apocalyptic number.

It is an amenable number.

40004000221 is a deficient number, since it is larger than the sum of its proper divisors (754792511).

40004000221 is an equidigital number, since it uses as much as digits as its factorization.

40004000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754792510.

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 40004000221 its reverse (12200040004), we get a palindrome (52204040225).

The spelling of 40004000221 in words is "forty billion, four million, two hundred twenty-one", and thus it is an aban number.