21222312112 has 20 divisors (see below), whose sum is σ = 41121727416. Its totient is φ = 10610253440.

The previous prime is 21222312079. The next prime is 21222312121. The reversal of 21222312112 is 21121322212.

It is a self number, because there is not a number n which added to its sum of digits gives 21222312112.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163548 + ... + 263044.

Almost surely, 2^21222312112 is an apocalyptic number.

It is an amenable number.

21222312112 is a deficient number, since it is larger than the sum of its proper divisors (19899415304).

21222312112 is a wasteful number, since it uses less digits than its factorization.

21222312112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112836 (or 112830 counting only the distinct ones).

The product of its digits is 192, while the sum is 19.

Adding to 21222312112 its reverse (21121322212), we get a palindrome (42343634324).

The spelling of 21222312112 in words is "twenty-one billion, two hundred twenty-two million, three hundred twelve thousand, one hundred twelve".