121111216105 has 16 divisors (see below), whose sum is σ = 161537022144. Its totient is φ = 86418978880.

The previous prime is 121111216103. The next prime is 121111216123. The reversal of 121111216105 is 501612111121.

It is not a de Polignac number, because 121111216105 - 2¹ = 121111216103 is a prime.

It is a super-2 number, since 2×121111216105² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121111216103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20770879 + ... + 20776708.

It is an arithmetic number, because the mean of its divisors is an integer number (10096063884).

Almost surely, 2^121111216105 is an apocalyptic number.

It is an amenable number.

121111216105 is a deficient number, since it is larger than the sum of its proper divisors (40425806039).

121111216105 is a wasteful number, since it uses less digits than its factorization.

121111216105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41547656.

The product of its (nonzero) digits is 120, while the sum is 22.

Adding to 121111216105 its reverse (501612111121), we get a palindrome (622723327226).

The spelling of 121111216105 in words is "one hundred twenty-one billion, one hundred eleven million, two hundred sixteen thousand, one hundred five".