21220022112 has 24 divisors (see below), whose sum is σ = 55702558296. Its totient is φ = 7073340672.

The previous prime is 21220022077. The next prime is 21220022119. The reversal of 21220022112 is 21122002212.

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 21220022091 and 21220022100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220022119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110520853 + ... + 110521044.

It is an arithmetic number, because the mean of its divisors is an integer number (2320939929).

Almost surely, 2^21220022112 is an apocalyptic number.

It is an amenable number.

21220022112 is an abundant number, since it is smaller than the sum of its proper divisors (34482536184).

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

21220022112 is a wasteful number, since it uses less digits than its factorization.

21220022112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221041910 (or 221041902 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21220022112 its reverse (21122002212), we get a palindrome (42342024324).

The spelling of 21220022112 in words is "twenty-one billion, two hundred twenty million, twenty-two thousand, one hundred twelve".