204222421 has 4 divisors (see below), whose sum is σ = 219931852. Its totient is φ = 188512992.

The previous prime is 204222419. The next prime is 204222433. The reversal of 204222421 is 124222402.

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 8614225 + 195608196 = 2935^2 + 13986^2 .

It is a cyclic number.

It is not a de Polignac number, because 204222421 - 2¹ = 204222419 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 (204222401) 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, 7854696 + ... + 7854721.

It is an arithmetic number, because the mean of its divisors is an integer number (54982963).

Almost surely, 2^204222421 is an apocalyptic number.

It is an amenable number.

204222421 is a deficient number, since it is larger than the sum of its proper divisors (15709431).

204222421 is a wasteful number, since it uses less digits than its factorization.

204222421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15709430.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 204222421 is about 14290.6410283094. The cubic root of 204222421 is about 588.8903984627.

Subtracting from 204222421 its sum of digits (19), we obtain a palindrome (204222402).

Adding to 204222421 its reverse (124222402), we get a palindrome (328444823).

The spelling of 204222421 in words is "two hundred four million, two hundred twenty-two thousand, four hundred twenty-one".