21210111110112 has 96 divisors (see below), whose sum is σ = 57611044713600. Its totient is φ = 6824509644288.

The previous prime is 21210111110059. The next prime is 21210111110191. The reversal of 21210111110112 is 21101111101212.

It is a tau number, because it is divible by the number of its divisors (96).

It is a junction number, because it is equal to n+sod(n) for n = 21210111110091 and 21210111110100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10023339 + ... + 11953557.

It is an arithmetic number, because the mean of its divisors is an integer number (600115049100).

Almost surely, 2^{21210111110112} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21210111110112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28805522356800).

21210111110112 is an abundant number, since it is smaller than the sum of its proper divisors (36400933603488).

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

21210111110112 is a wasteful number, since it uses less digits than its factorization.

21210111110112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1934208 (or 1934200 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21210111110112 its reverse (21101111101212), we get a palindrome (42311222211324).

The spelling of 21210111110112 in words is "twenty-one trillion, two hundred ten billion, one hundred eleven million, one hundred ten thousand, one hundred twelve".