21201222102112 has 48 divisors (see below), whose sum is σ = 47316492664560. Its totient is φ = 9270169984512.

The previous prime is 21201222102091. The next prime is 21201222102197. The reversal of 21201222102112 is 21120122210212.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21201222102112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1341162523 + ... + 1341178330.

It is an arithmetic number, because the mean of its divisors is an integer number (985760263845).

Almost surely, 2^{21201222102112} is an apocalyptic number.

It is an amenable number.

21201222102112 is an abundant number, since it is smaller than the sum of its proper divisors (26115270562448).

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

21201222102112 is a wasteful number, since it uses less digits than its factorization.

21201222102112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2682340895 (or 2682340887 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21201222102112 its reverse (21120122210212), we get a palindrome (42321344312324).

The spelling of 21201222102112 in words is "twenty-one trillion, two hundred one billion, two hundred twenty-two million, one hundred two thousand, one hundred twelve".