100120101121991 has 2 divisors, whose sum is σ = 100120101121992. Its totient is φ = 100120101121990.

The previous prime is 100120101121949. The next prime is 100120101122029. The reversal of 100120101121991 is 199121101021001.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100120101121991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100120101121591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50060050560995 + 50060050560996.

It is an arithmetic number, because the mean of its divisors is an integer number (50060050560996).

Almost surely, 2^{100120101121991} is an apocalyptic number.

100120101121991 is a deficient number, since it is larger than the sum of its proper divisors (1).

100120101121991 is an equidigital number, since it uses as much as digits as its factorization.

100120101121991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 29.

Adding to 100120101121991 its reverse (199121101021001), we get a palindrome (299241202142992).

The spelling of 100120101121991 in words is "one hundred trillion, one hundred twenty billion, one hundred one million, one hundred twenty-one thousand, nine hundred ninety-one".