21210210112 has 112 divisors (see below), whose sum is σ = 54528557440. Its totient is φ = 7949187072.

The previous prime is 21210210103. The next prime is 21210210113. The reversal of 21210210112 is 21101201212.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 21210210092 and 21210210101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210210113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14818 + ... + 206494.

It is an arithmetic number, because the mean of its divisors is an integer number (486862120).

Almost surely, 2^21210210112 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 21210210112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27264278720).

21210210112 is an abundant number, since it is smaller than the sum of its proper divisors (33318347328).

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

21210210112 is a wasteful number, since it uses less digits than its factorization.

21210210112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191728 (or 191718 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21210210112 its reverse (21101201212), we get a palindrome (42311411324).

The spelling of 21210210112 in words is "twenty-one billion, two hundred ten million, two hundred ten thousand, one hundred twelve".