20100001221191 has 2 divisors, whose sum is σ = 20100001221192. Its totient is φ = 20100001221190.

The previous prime is 20100001221121. The next prime is 20100001221193. The reversal of 20100001221191 is 19112210000102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20100001221191 - 2²² = 20099997026887 is a prime.

Together with 20100001221193, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20100001221193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050000610595 + 10050000610596.

It is an arithmetic number, because the mean of its divisors is an integer number (10050000610596).

Almost surely, 2^{20100001221191} is an apocalyptic number.

20100001221191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20100001221191 is an equidigital number, since it uses as much as digits as its factorization.

20100001221191 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 20100001221191 its reverse (19112210000102), we get a palindrome (39212211221293).

The spelling of 20100001221191 in words is "twenty trillion, one hundred billion, one million, two hundred twenty-one thousand, one hundred ninety-one".