221100000121204 has 12 divisors (see below), whose sum is σ = 392225342681284. Its totient is φ = 109035616497984.

The previous prime is 221100000121159. The next prime is 221100000121219. The reversal of 221100000121204 is 402121000001122.

It can be written as a sum of positive squares in 2 ways, for example, as 190844609881104 + 30255390240100 = 13814652^2 + 5500490^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378595890327 + ... + 378595890910.

Almost surely, 2^{221100000121204} is an apocalyptic number.

It is an amenable number.

221100000121204 is a deficient number, since it is larger than the sum of its proper divisors (171125342560080).

221100000121204 is a wasteful number, since it uses less digits than its factorization.

221100000121204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757191781314 (or 757191781312 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221100000121204 its reverse (402121000001122), we get a palindrome (623221000122326).

The spelling of 221100000121204 in words is "two hundred twenty-one trillion, one hundred billion, one hundred twenty-one thousand, two hundred four".