12111012011 has 4 divisors (see below), whose sum is σ = 13841156592. Its totient is φ = 10380867432.

The previous prime is 12111011999. The next prime is 12111012059. The reversal of 12111012011 is 11021011121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11021011121 = 3061 ⋅3600461.

It is a cyclic number.

It is not a de Polignac number, because 12111012011 - 2¹⁴ = 12110995627 is a prime.

It is a super-2 number, since 2×12111012011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12111011983 and 12111012001.

It is not an unprimeable number, because it can be changed into a prime (12119012011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 865072280 + ... + 865072293.

It is an arithmetic number, because the mean of its divisors is an integer number (3460289148).

Almost surely, 2^12111012011 is an apocalyptic number.

12111012011 is a deficient number, since it is larger than the sum of its proper divisors (1730144581).

12111012011 is an equidigital number, since it uses as much as digits as its factorization.

12111012011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1730144580.

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

Adding to 12111012011 its reverse (11021011121), we get a palindrome (23132023132).

The spelling of 12111012011 in words is "twelve billion, one hundred eleven million, twelve thousand, eleven".