10001000221 has 4 divisors (see below), whose sum is σ = 10113371100. Its totient is φ = 9888629344.

The previous prime is 10001000197. The next prime is 10001000239. The reversal of 10001000221 is 12200010001.

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 1921507225 + 8079492996 = 43835^2 + 89886^2 .

It is a cyclic number.

It is not a de Polignac number, because 10001000221 - 2¹¹ = 10000998173 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 (10001000521) 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, 56185306 + ... + 56185483.

It is an arithmetic number, because the mean of its divisors is an integer number (2528342775).

Almost surely, 2^10001000221 is an apocalyptic number.

It is an amenable number.

10001000221 is a deficient number, since it is larger than the sum of its proper divisors (112370879).

10001000221 is an equidigital number, since it uses as much as digits as its factorization.

10001000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112370878.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 10001000221 its reverse (12200010001), we get a palindrome (22201010222).

The spelling of 10001000221 in words is "ten billion, one million, two hundred twenty-one", and thus it is an aban number.