21012000200000 has 168 divisors, whose sum is σ = 52195447199448. Its totient is φ = 8392032000000.

The previous prime is 21012000199847. The next prime is 21012000200017. The reversal of 21012000200000 is 200021012.

It can be written as a sum of positive squares in 12 ways, for example, as 17004604784896 + 4007395415104 = 4123664^2 + 2001848^2 .

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 132120530 + ... + 132279470.

It is an arithmetic number, because the mean of its divisors is an integer number (310687185711).

Almost surely, 2^{21012000200000} is an apocalyptic number.

21012000200000 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 21012000200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26097723599724).

21012000200000 is an abundant number, since it is smaller than the sum of its proper divisors (31183446999448).

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

21012000200000 is an frugal number, since it uses more digits than its factorization.

21012000200000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159639 (or 159609 counting only the distinct ones).

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

Adding to 21012000200000 its reverse (200021012), we get a palindrome (21012200221012).

The spelling of 21012000200000 in words is "twenty-one trillion, twelve billion, two hundred thousand".