21020501200000 has 192 divisors, whose sum is σ = 52357073932800. Its totient is φ = 8405879680000.

The previous prime is 21020501199977. The next prime is 21020501200007. The reversal of 21020501200000 is 210502012.

It is a super-2 number, since 2×21020501200000² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21020501200007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2807596257 + ... + 2807603743.

It is an arithmetic number, because the mean of its divisors is an integer number (272693093400).

Almost surely, 2^{21020501200000} is an apocalyptic number.

21020501200000 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 21020501200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26178536966400).

21020501200000 is an abundant number, since it is smaller than the sum of its proper divisors (31336572732800).

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

21020501200000 is an frugal number, since it uses more digits than its factorization.

21020501200000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14545 (or 14513 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 13.

Adding to 21020501200000 its reverse (210502012), we get a palindrome (21020711702012).

The spelling of 21020501200000 in words is "twenty-one trillion, twenty billion, five hundred one million, two hundred thousand".