12212112222021 has 4 divisors (see below), whose sum is σ = 16282816296032. Its totient is φ = 8141408148012.

The previous prime is 12212112221993. The next prime is 12212112222043. The reversal of 12212112222021 is 12022221121221.

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 not a de Polignac number, because 12212112222021 - 2⁵ = 12212112221989 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 (12212112722021) 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, 2035352037001 + ... + 2035352037006.

It is an arithmetic number, because the mean of its divisors is an integer number (4070704074008).

Almost surely, 2^{12212112222021} is an apocalyptic number.

It is an amenable number.

12212112222021 is a deficient number, since it is larger than the sum of its proper divisors (4070704074011).

12212112222021 is an equidigital number, since it uses as much as digits as its factorization.

12212112222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4070704074010.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 12212112222021 its reverse (12022221121221), we get a palindrome (24234333343242).

The spelling of 12212112222021 in words is "twelve trillion, two hundred twelve billion, one hundred twelve million, two hundred twenty-two thousand, twenty-one".