21002100021112 has 128 divisors (see below), whose sum is σ = 46031836032000. Its totient is φ = 8797344675840.

The previous prime is 21002100021103. The next prime is 21002100021143. The reversal of 21002100021112 is 21112000120012.

It is a junction number, because it is equal to n+sod(n) for n = 21002100021092 and 21002100021101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 399701562 + ... + 399754102.

It is an arithmetic number, because the mean of its divisors is an integer number (359623719000).

Almost surely, 2^{21002100021112} 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 21002100021112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23015918016000).

21002100021112 is an abundant number, since it is smaller than the sum of its proper divisors (25029736010888).

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

21002100021112 is a wasteful number, since it uses less digits than its factorization.

21002100021112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53309 (or 53305 counting only the distinct ones).

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

Adding to 21002100021112 its reverse (21112000120012), we get a palindrome (42114100141124).

The spelling of 21002100021112 in words is "twenty-one trillion, two billion, one hundred million, twenty-one thousand, one hundred twelve".