21100120111099 has 4 divisors (see below), whose sum is σ = 22341303647064. Its totient is φ = 19858936575136.

The previous prime is 21100120111093. The next prime is 21100120111123. The reversal of 21100120111099 is 99011102100112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21100120111099 - 2²⁹ = 21099583240187 is a prime.

It is a super-2 number, since 2×21100120111099² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100120111093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620591767957 + ... + 620591767990.

It is an arithmetic number, because the mean of its divisors is an integer number (5585325911766).

Almost surely, 2^{21100120111099} is an apocalyptic number.

21100120111099 is a deficient number, since it is larger than the sum of its proper divisors (1241183535965).

21100120111099 is a wasteful number, since it uses less digits than its factorization.

21100120111099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241183535964.

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

The spelling of 21100120111099 in words is "twenty-one trillion, one hundred billion, one hundred twenty million, one hundred eleven thousand, ninety-nine".