100100120211991 has 2 divisors, whose sum is σ = 100100120211992. Its totient is φ = 100100120211990.

The previous prime is 100100120211977. The next prime is 100100120212013. The reversal of 100100120211991 is 199112021001001.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 100100120211991 - 2¹³ = 100100120203799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100100120211961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50050060105995 + 50050060105996.

It is an arithmetic number, because the mean of its divisors is an integer number (50050060105996).

Almost surely, 2^{100100120211991} is an apocalyptic number.

100100120211991 is a deficient number, since it is larger than the sum of its proper divisors (1).

100100120211991 is an equidigital number, since it uses as much as digits as its factorization.

100100120211991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 28.

Adding to 100100120211991 its reverse (199112021001001), we get a palindrome (299212141212992).

The spelling of 100100120211991 in words is "one hundred trillion, one hundred billion, one hundred twenty million, two hundred eleven thousand, nine hundred ninety-one".