12221222220121 has 8 divisors (see below), whose sum is σ = 12970141127424. Its totient is φ = 11475639255360.

The previous prime is 12221222220107. The next prime is 12221222220149. The reversal of 12221222220121 is 12102222212221.

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 12221222220121 - 2⁵ = 12221222220089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12221222220092 and 12221222220101.

It is not an unprimeable number, because it can be changed into a prime (12221222220161) 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, 833978085 + ... + 833992738.

It is an arithmetic number, because the mean of its divisors is an integer number (1621267640928).

Almost surely, 2^{12221222220121} is an apocalyptic number.

It is an amenable number.

12221222220121 is a deficient number, since it is larger than the sum of its proper divisors (748918907303).

12221222220121 is a wasteful number, since it uses less digits than its factorization.

12221222220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667971271.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 12221222220121 its reverse (12102222212221), we get a palindrome (24323444432342).

The spelling of 12221222220121 in words is "twelve trillion, two hundred twenty-one billion, two hundred twenty-two million, two hundred twenty thousand, one hundred twenty-one".