12021123211 has 4 divisors (see below), whose sum is σ = 12021708400. Its totient is φ = 12020538024.

The previous prime is 12021123199. The next prime is 12021123229. The reversal of 12021123211 is 11232112021.

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 12021123211 - 2¹⁹ = 12020598923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021123241) 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, 260616 + ... + 303253.

It is an arithmetic number, because the mean of its divisors is an integer number (3005427100).

Almost surely, 2^12021123211 is an apocalyptic number.

12021123211 is a deficient number, since it is larger than the sum of its proper divisors (585189).

12021123211 is an equidigital number, since it uses as much as digits as its factorization.

12021123211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585188.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 12021123211 its reverse (11232112021), we get a palindrome (23253235232).

The spelling of 12021123211 in words is "twelve billion, twenty-one million, one hundred twenty-three thousand, two hundred eleven".