12021111111211 has 4 divisors (see below), whose sum is σ = 12408888889024. Its totient is φ = 11633333333400.

The previous prime is 12021111111091. The next prime is 12021111111239. The reversal of 12021111111211 is 11211111112021.

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 12021111111211 - 2¹⁹ = 12021110586923 is a prime.

It is a super-2 number, since 2×12021111111211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021111111271) 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, 193888888860 + ... + 193888888921.

It is an arithmetic number, because the mean of its divisors is an integer number (3102222222256).

Almost surely, 2^{12021111111211} is an apocalyptic number.

12021111111211 is a deficient number, since it is larger than the sum of its proper divisors (387777777813).

12021111111211 is an equidigital number, since it uses as much as digits as its factorization.

12021111111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387777777812.

The product of its (nonzero) digits is 8, while the sum is 16.

Adding to 12021111111211 its reverse (11211111112021), we get a palindrome (23232222223232).

The spelling of 12021111111211 in words is "twelve trillion, twenty-one billion, one hundred eleven million, one hundred eleven thousand, two hundred eleven".