20331312123191 has 2 divisors, whose sum is σ = 20331312123192. Its totient is φ = 20331312123190.

The previous prime is 20331312123151. The next prime is 20331312123233. The reversal of 20331312123191 is 19132121313302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20331312123191 - 2⁶ = 20331312123127 is a prime.

It is a super-2 number, since 2×20331312123191² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20331312123151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165656061595 + 10165656061596.

It is an arithmetic number, because the mean of its divisors is an integer number (10165656061596).

Almost surely, 2^{20331312123191} is an apocalyptic number.

20331312123191 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331312123191 is an equidigital number, since it uses as much as digits as its factorization.

20331312123191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 32.

Adding to 20331312123191 its reverse (19132121313302), we get a palindrome (39463433436493).

The spelling of 20331312123191 in words is "twenty trillion, three hundred thirty-one billion, three hundred twelve million, one hundred twenty-three thousand, one hundred ninety-one".