21201122201112 has 72 divisors (see below), whose sum is σ = 66794351843700. Its totient is φ = 6057463485024.

The previous prime is 21201122201099. The next prime is 21201122201113. The reversal of 21201122201112 is 21110222110212.

It is a tau number, because it is divible by the number of its divisors (72).

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 (21201122201113) 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 17 ways as a sum of consecutive naturals, for example, 3004690662 + ... + 3004697717.

Almost surely, 2^{21201122201112} is an apocalyptic number.

It is an amenable number.

21201122201112 is an abundant number, since it is smaller than the sum of its proper divisors (45593229642588).

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

21201122201112 is a wasteful number, since it uses less digits than its factorization.

21201122201112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6009388405 (or 6009388391 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21201122201112 its reverse (21110222110212), we get a palindrome (42311344311324).

The spelling of 21201122201112 in words is "twenty-one trillion, two hundred one billion, one hundred twenty-two million, two hundred one thousand, one hundred twelve".