21011001102000 has 1280 divisors, whose sum is σ = 93487416422400. Its totient is φ = 4392307814400.

The previous prime is 21011001101969. The next prime is 21011001102001. The reversal of 21011001102000 is 20110011012.

It is a happy number.

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

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is not an unprimeable number, because it can be changed into a prime (21011001102001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 535606387 + ... + 535645613.

It is an arithmetic number, because the mean of its divisors is an integer number (73037044080).

Almost surely, 2^{21011001102000} is an apocalyptic number.

21011001102000 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 21011001102000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46743708211200).

21011001102000 is an abundant number, since it is smaller than the sum of its proper divisors (72476415320400).

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

21011001102000 is a wasteful number, since it uses less digits than its factorization.

21011001102000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39388 (or 39366 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21011001102000 its reverse (20110011012), we get a palindrome (21031111113012).

The spelling of 21011001102000 in words is "twenty-one trillion, eleven billion, one million, one hundred two thousand".