204012421 has 2 divisors, whose sum is σ = 204012422. Its totient is φ = 204012420.

The previous prime is 204012407. The next prime is 204012449. The reversal of 204012421 is 124210402.

204012421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166668100 + 37344321 = 12910^2 + 6111^2 .

It is a cyclic number.

It is not a de Polignac number, because 204012421 - 2⁷ = 204012293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 204012395 and 204012404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204012451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102006210 + 102006211.

It is an arithmetic number, because the mean of its divisors is an integer number (102006211).

Almost surely, 2^204012421 is an apocalyptic number.

It is an amenable number.

204012421 is a deficient number, since it is larger than the sum of its proper divisors (1).

204012421 is an equidigital number, since it uses as much as digits as its factorization.

204012421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 204012421 is about 14283.2916724402. The cubic root of 204012421 is about 588.6884790785.

Adding to 204012421 its reverse (124210402), we get a palindrome (328222823).

It can be divided in two parts, 20401 and 2421, that added together give a palindrome (22822).

The spelling of 204012421 in words is "two hundred four million, twelve thousand, four hundred twenty-one".