11111111012 has 24 divisors (see below), whose sum is σ = 19823001912. Its totient is φ = 5447520000.

The previous prime is 11111110979. The next prime is 11111111059. The reversal of 11111111012 is 21011111111.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 25969216 + 11085141796 = 5096^2 + 105286^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11111110984 and 11111111002.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 367262 + ... + 396362.

It is an arithmetic number, because the mean of its divisors is an integer number (825958413).

Almost surely, 2^11111111012 is an apocalyptic number.

It is an amenable number.

11111111012 is a deficient number, since it is larger than the sum of its proper divisors (8711890900).

11111111012 is a wasteful number, since it uses less digits than its factorization.

11111111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30959 (or 30957 counting only the distinct ones).

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

Adding to 11111111012 its reverse (21011111111), we get a palindrome (32122222123).

Subtracting 11111111012 from its reverse (21011111111), we obtain a palindrome (9900000099).

The spelling of 11111111012 in words is "eleven billion, one hundred eleven million, one hundred eleven thousand, twelve".