12011222021 has 4 divisors (see below), whose sum is σ = 12078324000. Its totient is φ = 11944120044.

The previous prime is 12011221969. The next prime is 12011222063. The reversal of 12011222021 is 12022211021.

12011222021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12011222021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12011221987 and 12011222005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12011222071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33550721 + ... + 33551078.

It is an arithmetic number, because the mean of its divisors is an integer number (3019581000).

Almost surely, 2^12011222021 is an apocalyptic number.

It is an amenable number.

12011222021 is a deficient number, since it is larger than the sum of its proper divisors (67101979).

12011222021 is an equidigital number, since it uses as much as digits as its factorization.

12011222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67101978.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12011222021 its reverse (12022211021), we get a palindrome (24033433042).

The spelling of 12011222021 in words is "twelve billion, eleven million, two hundred twenty-two thousand, twenty-one".