12213223121 has 4 divisors (see below), whose sum is σ = 13323516144. Its totient is φ = 11102930100.

The previous prime is 12213223111. The next prime is 12213223129. The reversal of 12213223121 is 12132231221.

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 not a de Polignac number, because 12213223121 - 2¹⁴ = 12213206737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12213223093 and 12213223102.

It is not an unprimeable number, because it can be changed into a prime (12213223129) 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, 555146495 + ... + 555146516.

It is an arithmetic number, because the mean of its divisors is an integer number (3330879036).

Almost surely, 2^12213223121 is an apocalyptic number.

12213223121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12213223121 is a deficient number, since it is larger than the sum of its proper divisors (1110293023).

12213223121 is a wasteful number, since it uses less digits than its factorization.

12213223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110293022.

The product of its digits is 288, while the sum is 20.

Adding to 12213223121 its reverse (12132231221), we get a palindrome (24345454342).

It can be divided in two parts, 1 and 2213223121, that added together give a palindrome (2213223122).

The spelling of 12213223121 in words is "twelve billion, two hundred thirteen million, two hundred twenty-three thousand, one hundred twenty-one".