22221212012 has 12 divisors (see below), whose sum is σ = 38931468240. Its totient is φ = 11097935376.

The previous prime is 22221211979. The next prime is 22221212017. The reversal of 22221212012 is 21021212222.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (22221212017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3163712 + ... + 3170727.

It is an arithmetic number, because the mean of its divisors is an integer number (3244289020).

Almost surely, 2^22221212012 is an apocalyptic number.

It is an amenable number.

22221212012 is a deficient number, since it is larger than the sum of its proper divisors (16710256228).

22221212012 is a wasteful number, since it uses less digits than its factorization.

22221212012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6335320 (or 6335318 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 22221212012 its reverse (21021212222), we get a palindrome (43242424234).

The spelling of 22221212012 in words is "twenty-two billion, two hundred twenty-one million, two hundred twelve thousand, twelve".