204426821 has 8 divisors (see below), whose sum is σ = 209450304. Its totient is φ = 199463040.

The previous prime is 204426787. The next prime is 204426823. The reversal of 204426821 is 128624402.

204426821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a de Polignac number, because none of the positive numbers 2^k-204426821 is a prime.

It is a super-3 number, since 3×204426821³ (a number of 26 digits) contains 333 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 (204426823) 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, 7955 + ... + 21728.

It is an arithmetic number, because the mean of its divisors is an integer number (26181288).

Almost surely, 2^204426821 is an apocalyptic number.

It is an amenable number.

204426821 is a deficient number, since it is larger than the sum of its proper divisors (5023483).

204426821 is an equidigital number, since it uses as much as digits as its factorization.

204426821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29851.

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 204426821 is about 14297.7907734027. The cubic root of 204426821 is about 589.0868004399.

The spelling of 204426821 in words is "two hundred four million, four hundred twenty-six thousand, eight hundred twenty-one".