21011022100000 has 288 divisors, whose sum is σ = 54558209301120. Its totient is φ = 7948596480000.

The previous prime is 21011022099953. The next prime is 21011022100111. The reversal of 21011022100000 is 122011012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a self number, because there is not a number n which added to its sum of digits gives 21011022100000.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 204648679 + ... + 204751321.

It is an arithmetic number, because the mean of its divisors is an integer number (189438226740).

Almost surely, 2^{21011022100000} is an apocalyptic number.

21011022100000 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 21011022100000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27279104650560).

21011022100000 is an abundant number, since it is smaller than the sum of its proper divisors (33547187201120).

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

21011022100000 is an equidigital number, since it uses as much as digits as its factorization.

21011022100000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102790 (or 102762 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21011022100000 its reverse (122011012), we get a palindrome (21011144111012).

The spelling of 21011022100000 in words is "twenty-one trillion, eleven billion, twenty-two million, one hundred thousand".