21012020200000 has 336 divisors, whose sum is σ = 54973352730240. Its totient is φ = 7945896960000.

The previous prime is 21012020199979. The next prime is 21012020200049. The reversal of 21012020200000 is 202021012.

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 21012020200000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1911394504 + ... + 1911405496.

It is an arithmetic number, because the mean of its divisors is an integer number (163611168840).

Almost surely, 2^{21012020200000} is an apocalyptic number.

21012020200000 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 21012020200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27486676365120).

21012020200000 is an abundant number, since it is smaller than the sum of its proper divisors (33961332530240).

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

21012020200000 is an equidigital number, since it uses as much as digits as its factorization.

21012020200000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11552 (or 11522 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21012020200000 its reverse (202021012), we get a palindrome (21012222221012).

The spelling of 21012020200000 in words is "twenty-one trillion, twelve billion, twenty million, two hundred thousand".