204123221413 has 4 divisors (see below), whose sum is σ = 205345516320. Its totient is φ = 202900926508.

The previous prime is 204123221381. The next prime is 204123221473. The reversal of 204123221413 is 314122321402.

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 204123221413 - 2⁵ = 204123221381 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 (204123221473) 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, 611147203 + ... + 611147536.

It is an arithmetic number, because the mean of its divisors is an integer number (51336379080).

Almost surely, 2^204123221413 is an apocalyptic number.

It is an amenable number.

204123221413 is a deficient number, since it is larger than the sum of its proper divisors (1222294907).

204123221413 is a wasteful number, since it uses less digits than its factorization.

204123221413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222294906.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 204123221413 its reverse (314122321402), we get a palindrome (518245542815).

The spelling of 204123221413 in words is "two hundred four billion, one hundred twenty-three million, two hundred twenty-one thousand, four hundred thirteen".