204130551421 has 2 divisors, whose sum is σ = 204130551422. Its totient is φ = 204130551420.

The previous prime is 204130551409. The next prime is 204130551431. The reversal of 204130551421 is 124155031402.

204130551421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187044140196 + 17086411225 = 432486^2 + 130715^2 .

It is a cyclic number.

It is not a de Polignac number, because 204130551421 - 2⁹ = 204130550909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204130551421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (204130551431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102065275710 + 102065275711.

It is an arithmetic number, because the mean of its divisors is an integer number (102065275711).

Almost surely, 2^204130551421 is an apocalyptic number.

It is an amenable number.

204130551421 is a deficient number, since it is larger than the sum of its proper divisors (1).

204130551421 is an equidigital number, since it uses as much as digits as its factorization.

204130551421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 204130551421 its reverse (124155031402), we get a palindrome (328285582823).

The spelling of 204130551421 in words is "two hundred four billion, one hundred thirty million, five hundred fifty-one thousand, four hundred twenty-one".