111212102105 has 16 divisors (see below), whose sum is σ = 144601988160. Its totient is φ = 81622012608.

The previous prime is 111212102083. The next prime is 111212102119. The reversal of 111212102105 is 501201212111.

It is a cyclic number.

It is not a de Polignac number, because 111212102105 - 2¹⁶ = 111212036569 is a prime.

It is a super-2 number, since 2×111212102105² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5237735 + ... + 5258924.

It is an arithmetic number, because the mean of its divisors is an integer number (9037624260).

Almost surely, 2^111212102105 is an apocalyptic number.

It is an amenable number.

111212102105 is a deficient number, since it is larger than the sum of its proper divisors (33389886055).

111212102105 is a wasteful number, since it uses less digits than its factorization.

111212102105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10496840.

The product of its (nonzero) digits is 40, while the sum is 17.

Adding to 111212102105 its reverse (501201212111), we get a palindrome (612413314216).

The spelling of 111212102105 in words is "one hundred eleven billion, two hundred twelve million, one hundred two thousand, one hundred five".