12111021311 has 4 divisors (see below), whose sum is σ = 12114043272. Its totient is φ = 12107999352.

The previous prime is 12111021281. The next prime is 12111021319. The reversal of 12111021311 is 11312011121.

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 12111021311 - 2¹⁰ = 12111020287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111021319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1504961 + ... + 1512986.

It is an arithmetic number, because the mean of its divisors is an integer number (3028510818).

Almost surely, 2^12111021311 is an apocalyptic number.

12111021311 is a deficient number, since it is larger than the sum of its proper divisors (3021961).

12111021311 is an equidigital number, since it uses as much as digits as its factorization.

12111021311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3021960.

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 12111021311 its reverse (11312011121), we get a palindrome (23423032432).

The spelling of 12111021311 in words is "twelve billion, one hundred eleven million, twenty-one thousand, three hundred eleven".