204400240421 has 8 divisors (see below), whose sum is σ = 220560963840. Its totient is φ = 188302035312.

The previous prime is 204400240403. The next prime is 204400240439. The reversal of 204400240421 is 124042004402.

It is an interprime number because it is at equal distance from previous prime (204400240403) and next prime (204400240439).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 204400240421 - 2¹⁰ = 204400239397 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 (204400240441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15622781 + ... + 15635858.

It is an arithmetic number, because the mean of its divisors is an integer number (27570120480).

Almost surely, 2^204400240421 is an apocalyptic number.

It is an amenable number.

204400240421 is a deficient number, since it is larger than the sum of its proper divisors (16160723419).

204400240421 is a wasteful number, since it uses less digits than its factorization.

204400240421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31259155.

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

Adding to 204400240421 its reverse (124042004402), we get a palindrome (328442244823).

The spelling of 204400240421 in words is "two hundred four billion, four hundred million, two hundred forty thousand, four hundred twenty-one".