12222111021 has 4 divisors (see below), whose sum is σ = 16296148032. Its totient is φ = 8148074012.

The previous prime is 12222111007. The next prime is 12222111023. The reversal of 12222111021 is 12011122221.

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-12222111021 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12222111023) 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, 2037018501 + ... + 2037018506.

It is an arithmetic number, because the mean of its divisors is an integer number (4074037008).

Almost surely, 2^12222111021 is an apocalyptic number.

It is an amenable number.

12222111021 is a deficient number, since it is larger than the sum of its proper divisors (4074037011).

12222111021 is an equidigital number, since it uses as much as digits as its factorization.

12222111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4074037010.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12222111021 its reverse (12011122221), we get a palindrome (24233233242).

The spelling of 12222111021 in words is "twelve billion, two hundred twenty-two million, one hundred eleven thousand, twenty-one".