204023331221 has 4 divisors (see below), whose sum is σ = 205629814272. Its totient is φ = 202416848172.

The previous prime is 204023331143. The next prime is 204023331247. The reversal of 204023331221 is 122133320402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 204023331221 - 2²⁶ = 203956222357 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 (204023336221) 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, 803241335 + ... + 803241588.

It is an arithmetic number, because the mean of its divisors is an integer number (51407453568).

Almost surely, 2^204023331221 is an apocalyptic number.

It is an amenable number.

204023331221 is a deficient number, since it is larger than the sum of its proper divisors (1606483051).

204023331221 is a wasteful number, since it uses less digits than its factorization.

204023331221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1606483050.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 204023331221 its reverse (122133320402), we get a palindrome (326156651623).

The spelling of 204023331221 in words is "two hundred four billion, twenty-three million, three hundred thirty-one thousand, two hundred twenty-one".