21000220110000 has 200 divisors, whose sum is σ = 75323901573360. Its totient is φ = 5600058624000.

The previous prime is 21000220109983. The next prime is 21000220110007. The reversal of 21000220110000 is 1102200012.

It is a tau number, because it is divible by the number of its divisors (200).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (21000220110007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 38619297 + ... + 39159296.

Almost surely, 2^{21000220110000} is an apocalyptic number.

21000220110000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000220110000 is an abundant number, since it is smaller than the sum of its proper divisors (54323681463360).

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

21000220110000 is an equidigital number, since it uses as much as digits as its factorization.

21000220110000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77778630 (or 77778603 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21000220110000 its reverse (1102200012), we get a palindrome (21001322310012).

The spelling of 21000220110000 in words is "twenty-one trillion, two hundred twenty million, one hundred ten thousand".