21223122112 has 56 divisors (see below), whose sum is σ = 42413986800. Its totient is φ = 10536324096.

The previous prime is 21223121993. The next prime is 21223122119. The reversal of 21223122112 is 21122132212.

It is a self number, because there is not a number n which added to its sum of digits gives 21223122112.

It is not an unprimeable number, because it can be changed into a prime (21223122119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12245598 + ... + 12247330.

Almost surely, 2^21223122112 is an apocalyptic number.

It is an amenable number.

21223122112 is a deficient number, since it is larger than the sum of its proper divisors (21190864688).

21223122112 is a wasteful number, since it uses less digits than its factorization.

21223122112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2993 (or 2983 counting only the distinct ones).

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

Adding to 21223122112 its reverse (21122132212), we get a palindrome (42345254324).

The spelling of 21223122112 in words is "twenty-one billion, two hundred twenty-three million, one hundred twenty-two thousand, one hundred twelve".