21010102112 has 48 divisors (see below), whose sum is σ = 43629969600. Its totient is φ = 9931743360.

The previous prime is 21010102097. The next prime is 21010102181. The reversal of 21010102112 is 21120101012.

It is a junction number, because it is equal to n+sod(n) for n = 21010102093 and 21010102102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 263339 + ... + 333717.

It is an arithmetic number, because the mean of its divisors is an integer number (908957700).

Almost surely, 2^21010102112 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 21010102112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21814984800).

21010102112 is an abundant number, since it is smaller than the sum of its proper divisors (22619867488).

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

21010102112 is a wasteful number, since it uses less digits than its factorization.

21010102112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70899 (or 70891 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21010102112 its reverse (21120101012), we get a palindrome (42130203124).

The spelling of 21010102112 in words is "twenty-one billion, ten million, one hundred two thousand, one hundred twelve".