21025021200000 has 384 divisors, whose sum is σ = 70098200928000. Its totient is φ = 5583137280000.

The previous prime is 21025021199999. The next prime is 21025021200067. The reversal of 21025021200000 is 212052012.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (15).

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, 286763346 + ... + 286836654.

It is an arithmetic number, because the mean of its divisors is an integer number (182547398250).

Almost surely, 2^{21025021200000} is an apocalyptic number.

21025021200000 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 21025021200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35049100464000).

21025021200000 is an abundant number, since it is smaller than the sum of its proper divisors (49073179728000).

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

21025021200000 is an frugal number, since it uses more digits than its factorization.

21025021200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73590 (or 73558 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

Adding to 21025021200000 its reverse (212052012), we get a palindrome (21025233252012).

The spelling of 21025021200000 in words is "twenty-one trillion, twenty-five billion, twenty-one million, two hundred thousand".