21210221211112 has 16 divisors (see below), whose sum is σ = 39991338878400. Its totient is φ = 10545864176880.

The previous prime is 21210221211043. The next prime is 21210221211119. The reversal of 21210221211112 is 21111212201212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21210221211112.

It is not an unprimeable number, because it can be changed into a prime (21210221211119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7405802064 + ... + 7405804927.

It is an arithmetic number, because the mean of its divisors is an integer number (2499458679900).

Almost surely, 2^{21210221211112} is an apocalyptic number.

It is an amenable number.

21210221211112 is a deficient number, since it is larger than the sum of its proper divisors (18781117667288).

21210221211112 is a wasteful number, since it uses less digits than its factorization.

21210221211112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14811607176 (or 14811607172 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 21210221211112 its reverse (21111212201212), we get a palindrome (42321433412324).

The spelling of 21210221211112 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty-one million, two hundred eleven thousand, one hundred twelve".