21220012220112 has 60 divisors (see below), whose sum is σ = 59941576618560. Its totient is φ = 7007231444544.

The previous prime is 21220012220111. The next prime is 21220012220123. The reversal of 21220012220112 is 21102221002212.

It is a happy number.

21220012220112 is a `hidden beast` number, since 212 + 200 + 122 + 20 + 112 = 666.

It is a super-3 number, since 3×21220012220112³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220012220111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 688588312 + ... + 688619127.

It is an arithmetic number, because the mean of its divisors is an integer number (999026276976).

Almost surely, 2^{21220012220112} is an apocalyptic number.

It is an amenable number.

21220012220112 is an abundant number, since it is smaller than the sum of its proper divisors (38721564398448).

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

21220012220112 is a wasteful number, since it uses less digits than its factorization.

21220012220112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377207560 (or 1377207551 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21220012220112 its reverse (21102221002212), we get a palindrome (42322233222324).

The spelling of 21220012220112 in words is "twenty-one trillion, two hundred twenty billion, twelve million, two hundred twenty thousand, one hundred twelve".