21112210020000 has 480 divisors, whose sum is σ = 75817452199104. Its totient is φ = 5099852800000.

The previous prime is 21112210019951. The next prime is 21112210020023. The reversal of 21112210020000 is 2001221112.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 185403082 + ... + 185516918.

Almost surely, 2^{21112210020000} is an apocalyptic number.

21112210020000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21112210020000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37908726099552).

21112210020000 is an abundant number, since it is smaller than the sum of its proper divisors (54705242179104).

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

21112210020000 is a wasteful number, since it uses less digits than its factorization.

21112210020000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114162 (or 114139 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21112210020000 its reverse (2001221112), we get a palindrome (21114211241112).

The spelling of 21112210020000 in words is "twenty-one trillion, one hundred twelve billion, two hundred ten million, twenty thousand".