20001210120191 has 2 divisors, whose sum is σ = 20001210120192. Its totient is φ = 20001210120190.

The previous prime is 20001210120083. The next prime is 20001210120247. The reversal of 20001210120191 is 19102101210002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20001210120191 - 2²² = 20001205925887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20001210180191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000605060095 + 10000605060096.

It is an arithmetic number, because the mean of its divisors is an integer number (10000605060096).

Almost surely, 2^{20001210120191} is an apocalyptic number.

20001210120191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001210120191 is an equidigital number, since it uses as much as digits as its factorization.

20001210120191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 20001210120191 its reverse (19102101210002), we get a palindrome (39103311330193).

The spelling of 20001210120191 in words is "twenty trillion, one billion, two hundred ten million, one hundred twenty thousand, one hundred ninety-one".