204667161221 has 16 divisors (see below), whose sum is σ = 225831932928. Its totient is φ = 184832630400.

The previous prime is 204667161173. The next prime is 204667161271. The reversal of 204667161221 is 122161766402.

It is a happy number.

204667161221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 204667161221 - 2⁶ = 204667161157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204667161271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3471386 + ... + 3529851.

It is an arithmetic number, because the mean of its divisors is an integer number (14114495808).

Almost surely, 2^204667161221 is an apocalyptic number.

It is an amenable number.

204667161221 is a deficient number, since it is larger than the sum of its proper divisors (21164771707).

204667161221 is a wasteful number, since it uses less digits than its factorization.

204667161221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7001332.

The product of its (nonzero) digits is 48384, while the sum is 38.

The spelling of 204667161221 in words is "two hundred four billion, six hundred sixty-seven million, one hundred sixty-one thousand, two hundred twenty-one".