20123220122191 has 2 divisors, whose sum is σ = 20123220122192. Its totient is φ = 20123220122190.

The previous prime is 20123220122177. The next prime is 20123220122227. The reversal of 20123220122191 is 19122102232102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20123220122191 - 2³⁹ = 19573464308303 is a prime.

It is a super-3 number, since 3×20123220122191³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20123220122111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061610061095 + 10061610061096.

It is an arithmetic number, because the mean of its divisors is an integer number (10061610061096).

Almost surely, 2^{20123220122191} is an apocalyptic number.

20123220122191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123220122191 is an equidigital number, since it uses as much as digits as its factorization.

20123220122191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

Adding to 20123220122191 its reverse (19122102232102), we get a palindrome (39245322354293).

The spelling of 20123220122191 in words is "twenty trillion, one hundred twenty-three billion, two hundred twenty million, one hundred twenty-two thousand, one hundred ninety-one".