20003121191 has 2 divisors, whose sum is σ = 20003121192. Its totient is φ = 20003121190.

The previous prime is 20003121161. The next prime is 20003121209. The reversal of 20003121191 is 19112130002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20003121191 - 2²² = 19998926887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20003121161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001560595 + 10001560596.

It is an arithmetic number, because the mean of its divisors is an integer number (10001560596).

Almost surely, 2^20003121191 is an apocalyptic number.

20003121191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20003121191 is an equidigital number, since it uses as much as digits as its factorization.

20003121191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 20003121191 its reverse (19112130002), we get a palindrome (39115251193).

The spelling of 20003121191 in words is "twenty billion, three million, one hundred twenty-one thousand, one hundred ninety-one".