204424020091 has 2 divisors, whose sum is σ = 204424020092. Its totient is φ = 204424020090.

The previous prime is 204424020013. The next prime is 204424020113. The reversal of 204424020091 is 190020424402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204424020091 - 2¹⁹ = 204423495803 is a prime.

It is not a weakly prime, because it can be changed into another prime (204424020191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102212010045 + 102212010046.

It is an arithmetic number, because the mean of its divisors is an integer number (102212010046).

Almost surely, 2^204424020091 is an apocalyptic number.

204424020091 is a deficient number, since it is larger than the sum of its proper divisors (1).

204424020091 is an equidigital number, since it uses as much as digits as its factorization.

204424020091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 204424020091 its reverse (190020424402), we get a palindrome (394444444493).

The spelling of 204424020091 in words is "two hundred four billion, four hundred twenty-four million, twenty thousand, ninety-one".