221100000121205 has 16 divisors (see below), whose sum is σ = 273155817000000. Its totient is φ = 171706594445568.

The previous prime is 221100000121159. The next prime is 221100000121219. The reversal of 221100000121205 is 502121000001122.

It is a cyclic number.

It is not a de Polignac number, because 221100000121205 - 2²⁰ = 221099999072629 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3154480580 + ... + 3154550669.

It is an arithmetic number, because the mean of its divisors is an integer number (17072238562500).

Almost surely, 2^{221100000121205} is an apocalyptic number.

It is an amenable number.

221100000121205 is a deficient number, since it is larger than the sum of its proper divisors (52055816878795).

221100000121205 is a wasteful number, since it uses less digits than its factorization.

221100000121205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6309031460.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 221100000121205 its reverse (502121000001122), we get a palindrome (723221000122327).

The spelling of 221100000121205 in words is "two hundred twenty-one trillion, one hundred billion, one hundred twenty-one thousand, two hundred five".