204210430091 has 2 divisors, whose sum is σ = 204210430092. Its totient is φ = 204210430090.

The previous prime is 204210430031. The next prime is 204210430093. The reversal of 204210430091 is 190034012402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204210430091 - 2¹⁴ = 204210413707 is a prime.

Together with 204210430093, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 204210430091.

It is not a weakly prime, because it can be changed into another prime (204210430093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102105215045 + 102105215046.

It is an arithmetic number, because the mean of its divisors is an integer number (102105215046).

Almost surely, 2^204210430091 is an apocalyptic number.

204210430091 is a deficient number, since it is larger than the sum of its proper divisors (1).

204210430091 is an equidigital number, since it uses as much as digits as its factorization.

204210430091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 204210430091 its reverse (190034012402), we get a palindrome (394244442493).

The spelling of 204210430091 in words is "two hundred four billion, two hundred ten million, four hundred thirty thousand, ninety-one".