12222222012221 has 24 divisors (see below), whose sum is σ = 14222379207744. Its totient is φ = 10459917262080.

The previous prime is 12222222012211. The next prime is 12222222012227. The reversal of 12222222012221 is 12221022222221.

It is a de Polignac number, because none of the positive numbers 2^k-12222222012221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12222222012227) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31555025 + ... + 31940006.

It is an arithmetic number, because the mean of its divisors is an integer number (592599133656).

Almost surely, 2^{12222222012221} is an apocalyptic number.

It is an amenable number.

12222222012221 is a deficient number, since it is larger than the sum of its proper divisors (2000157195523).

12222222012221 is a wasteful number, since it uses less digits than its factorization.

12222222012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63495141 (or 63495128 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 12222222012221 its reverse (12221022222221), we get a palindrome (24443244234442).

The spelling of 12222222012221 in words is "twelve trillion, two hundred twenty-two billion, two hundred twenty-two million, twelve thousand, two hundred twenty-one".