12011111012 has 6 divisors (see below), whose sum is σ = 21019444278. Its totient is φ = 6005555504.

The previous prime is 12011110973. The next prime is 12011111033. The reversal of 12011111012 is 21011111021.

It can be written as a sum of positive squares in only one way, i.e., 11589383716 + 421727296 = 107654^2 + 20536^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12011110984 and 12011111002.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1501388873 + ... + 1501388880.

It is an arithmetic number, because the mean of its divisors is an integer number (3503240713).

Almost surely, 2^12011111012 is an apocalyptic number.

It is an amenable number.

12011111012 is a deficient number, since it is larger than the sum of its proper divisors (9008333266).

12011111012 is a wasteful number, since it uses less digits than its factorization.

12011111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3002777757 (or 3002777755 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 12011111012 its reverse (21011111021), we get a palindrome (33022222033).

Subtracting 12011111012 from its reverse (21011111021), we obtain a palindrome (9000000009).

The spelling of 12011111012 in words is "twelve billion, eleven million, one hundred eleven thousand, twelve".