21210102112 has 72 divisors (see below), whose sum is σ = 43052400720. Its totient is φ = 10283258880.

The previous prime is 21210102107. The next prime is 21210102113. The reversal of 21210102112 is 21120101212.

It is a junction number, because it is equal to n+sod(n) for n = 21210102092 and 21210102101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210102113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10401189 + ... + 10403227.

It is an arithmetic number, because the mean of its divisors is an integer number (597950010).

Almost surely, 2^21210102112 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 21210102112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21526200360).

21210102112 is an abundant number, since it is smaller than the sum of its proper divisors (21842298608).

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

21210102112 is an equidigital number, since it uses as much as digits as its factorization.

21210102112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2256 (or 2175 counting only the distinct ones).

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

Adding to 21210102112 its reverse (21120101212), we get a palindrome (42330203324).

The spelling of 21210102112 in words is "twenty-one billion, two hundred ten million, one hundred two thousand, one hundred twelve".