12222222222221 has 16 divisors (see below), whose sum is σ = 13756866543360. Its totient is φ = 10763474205120.

The previous prime is 12222222222211. The next prime is 12222222222251.

12222222222221 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 12222222222221 - 2⁶ = 12222222222157 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 (12222222222211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132639770 + ... + 132731883.

It is an arithmetic number, because the mean of its divisors is an integer number (859804158960).

Almost surely, 2^{12222222222221} is an apocalyptic number.

12222222222221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12222222222221 is a deficient number, since it is larger than the sum of its proper divisors (1534644321139).

12222222222221 is a wasteful number, since it uses less digits than its factorization.

12222222222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265371796.

The product of its digits is 4096, while the sum is 26.

It can be divided in two parts, 1222222 and 2222221, that added together give a palindrome (3444443).

The spelling of 12222222222221 in words is "twelve trillion, two hundred twenty-two billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-one".