204422400221 has 4 divisors (see below), whose sum is σ = 220147200252. Its totient is φ = 188697600192.

The previous prime is 204422400199. The next prime is 204422400233. The reversal of 204422400221 is 122004224402.

204422400221 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 117624991225 + 86797408996 = 342965^2 + 294614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204422400221 is a prime.

It is a super-2 number, since 2×204422400221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204422400251) 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 3 ways as a sum of consecutive naturals, for example, 7862399996 + ... + 7862400021.

It is an arithmetic number, because the mean of its divisors is an integer number (55036800063).

Almost surely, 2^204422400221 is an apocalyptic number.

It is an amenable number.

204422400221 is a deficient number, since it is larger than the sum of its proper divisors (15724800031).

204422400221 is a wasteful number, since it uses less digits than its factorization.

204422400221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15724800030.

The product of its (nonzero) digits is 2048, while the sum is 23.

Adding to 204422400221 its reverse (122004224402), we get a palindrome (326426624623).

The spelling of 204422400221 in words is "two hundred four billion, four hundred twenty-two million, four hundred thousand, two hundred twenty-one".