12012011311 has 4 divisors (see below), whose sum is σ = 12012251400. Its totient is φ = 12011771224.

The previous prime is 12012011293. The next prime is 12012011339. The reversal of 12012011311 is 11311021021.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12012011311 - 2¹³ = 12012003119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12012011291 and 12012011300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012011371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13441 + ... + 155578.

It is an arithmetic number, because the mean of its divisors is an integer number (3003062850).

Almost surely, 2^12012011311 is an apocalyptic number.

12012011311 is a deficient number, since it is larger than the sum of its proper divisors (240089).

12012011311 is an equidigital number, since it uses as much as digits as its factorization.

12012011311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240088.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 12012011311 its reverse (11311021021), we get a palindrome (23323032332).

The spelling of 12012011311 in words is "twelve billion, twelve million, eleven thousand, three hundred eleven".