20110120099991 has 2 divisors, whose sum is σ = 20110120099992. Its totient is φ = 20110120099990.

The previous prime is 20110120099963. The next prime is 20110120100029. The reversal of 20110120099991 is 19999002101102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20110120099991 - 2¹⁴ = 20110120083607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20110180099991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055060049995 + 10055060049996.

It is an arithmetic number, because the mean of its divisors is an integer number (10055060049996).

Almost surely, 2^{20110120099991} is an apocalyptic number.

20110120099991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20110120099991 is an equidigital number, since it uses as much as digits as its factorization.

20110120099991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 44.

The spelling of 20110120099991 in words is "twenty trillion, one hundred ten billion, one hundred twenty million, ninety-nine thousand, nine hundred ninety-one".