12221266442 has 96 divisors (see below), whose sum is σ = 24681718656. Its totient is φ = 4426583040.

The previous prime is 12221266441. The next prime is 12221266471. The reversal of 12221266442 is 24466212221.

It is a junction number, because it is equal to n+sod(n) for n = 12221266399 and 12221266408.

It is not an unprimeable number, because it can be changed into a prime (12221266441) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2387678 + ... + 2392790.

It is an arithmetic number, because the mean of its divisors is an integer number (257101236).

Almost surely, 2^12221266442 is an apocalyptic number.

12221266442 is an abundant number, since it is smaller than the sum of its proper divisors (12460452214).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12221266442 is a wasteful number, since it uses less digits than its factorization.

12221266442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5244 (or 5233 counting only the distinct ones).

The product of its digits is 18432, while the sum is 32.

Adding to 12221266442 its reverse (24466212221), we get a palindrome (36687478663).

The spelling of 12221266442 in words is "twelve billion, two hundred twenty-one million, two hundred sixty-six thousand, four hundred forty-two".