204126421 has 4 divisors (see below), whose sum is σ = 207173152. Its totient is φ = 201079692.

The previous prime is 204126401. The next prime is 204126431. The reversal of 204126421 is 124621402.

It is a happy number.

204126421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 204126421 - 2¹¹ = 204124373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204126392 and 204126401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204126401) 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, 1523265 + ... + 1523398.

It is an arithmetic number, because the mean of its divisors is an integer number (51793288).

Almost surely, 2^204126421 is an apocalyptic number.

It is an amenable number.

204126421 is a deficient number, since it is larger than the sum of its proper divisors (3046731).

204126421 is an equidigital number, since it uses as much as digits as its factorization.

204126421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3046730.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 204126421 is about 14287.2817918595. The cubic root of 204126421 is about 588.7981096425.

Adding to 204126421 its reverse (124621402), we get a palindrome (328747823).

The spelling of 204126421 in words is "two hundred four million, one hundred twenty-six thousand, four hundred twenty-one".