21120100120105 has 16 divisors (see below), whose sum is σ = 29331350622720. Its totient is φ = 14299033424832.

The previous prime is 21120100120039. The next prime is 21120100120201. The reversal of 21120100120105 is 50102100102112.

It is a cyclic number.

It is not a de Polignac number, because 21120100120105 - 2⁷ = 21120100119977 is a prime.

It is a super-2 number, since 2×21120100120105² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3819183514 + ... + 3819189043.

It is an arithmetic number, because the mean of its divisors is an integer number (1833209413920).

Almost surely, 2^{21120100120105} is an apocalyptic number.

It is an amenable number.

21120100120105 is a deficient number, since it is larger than the sum of its proper divisors (8211250502615).

21120100120105 is an equidigital number, since it uses as much as digits as its factorization.

21120100120105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7638372648.

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 21120100120105 its reverse (50102100102112), we get a palindrome (71222200222217).

The spelling of 21120100120105 in words is "twenty-one trillion, one hundred twenty billion, one hundred million, one hundred twenty thousand, one hundred five".