121112020105 has 4 divisors (see below), whose sum is σ = 145334424132. Its totient is φ = 96889616080.

The previous prime is 121112020087. The next prime is 121112020121. The reversal of 121112020105 is 501020211121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15473369664 + 105638650441 = 124392^2 + 325021^2 .

It is not a de Polignac number, because 121112020105 - 2⁹ = 121112019593 is a prime.

It is a super-2 number, since 2×121112020105² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12111202006 + ... + 12111202015.

It is an arithmetic number, because the mean of its divisors is an integer number (36333606033).

Almost surely, 2^121112020105 is an apocalyptic number.

It is an amenable number.

121112020105 is a deficient number, since it is larger than the sum of its proper divisors (24222404027).

121112020105 is an equidigital number, since it uses as much as digits as its factorization.

121112020105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24222404026.

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

Adding to 121112020105 its reverse (501020211121), we get a palindrome (622132231226).

The spelling of 121112020105 in words is "one hundred twenty-one billion, one hundred twelve million, twenty thousand, one hundred five".