10111111112 has 8 divisors (see below), whose sum is σ = 18958333350. Its totient is φ = 5055555552.

The previous prime is 10111111103. The next prime is 10111111159. The reversal of 10111111112 is 21111111101.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7912814116 + 2198296996 = 88954^2 + 46886^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 10111111093 and 10111111102.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631944437 + ... + 631944452.

Almost surely, 2^10111111112 is an apocalyptic number.

It is an amenable number.

10111111112 is a deficient number, since it is larger than the sum of its proper divisors (8847222238).

10111111112 is a wasteful number, since it uses less digits than its factorization.

10111111112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1263888895 (or 1263888891 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 11.

Subtracting from 10111111112 its sum of digits (11), we obtain a palindrome (10111111101).

Adding to 10111111112 its reverse (21111111101), we get a palindrome (31222222213).

The spelling of 10111111112 in words is "ten billion, one hundred eleven million, one hundred eleven thousand, one hundred twelve".