12122111220221 has 8 divisors (see below), whose sum is σ = 12221741259840. Its totient is φ = 12022658618112.

The previous prime is 12122111220217. The next prime is 12122111220251. The reversal of 12122111220221 is 12202211122121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12122111220221 - 2² = 12122111220217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12122111220193 and 12122111220202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12122111220251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44222180 + ... + 44495453.

It is an arithmetic number, because the mean of its divisors is an integer number (1527717657480).

Almost surely, 2^{12122111220221} is an apocalyptic number.

It is an amenable number.

12122111220221 is a deficient number, since it is larger than the sum of its proper divisors (99630039619).

12122111220221 is an equidigital number, since it uses as much as digits as its factorization.

12122111220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88718755.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 12122111220221 its reverse (12202211122121), we get a palindrome (24324322342342).

The spelling of 12122111220221 in words is "twelve trillion, one hundred twenty-two billion, one hundred eleven million, two hundred twenty thousand, two hundred twenty-one".