21200221021200 has 360 divisors, whose sum is σ = 74295353105568. Its totient is φ = 5164712017920.

The previous prime is 21200221021171. The next prime is 21200221021211. The reversal of 21200221021200 is 212012200212.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21200221021200.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 19132747 + ... + 20210453.

Almost surely, 2^{21200221021200} is an apocalyptic number.

21200221021200 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 21200221021200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37147676552784).

21200221021200 is an abundant number, since it is smaller than the sum of its proper divisors (53095132084368).

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

21200221021200 is a wasteful number, since it uses less digits than its factorization.

21200221021200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077851 (or 1077827 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21200221021200 its reverse (212012200212), we get a palindrome (21412233221412).

The spelling of 21200221021200 in words is "twenty-one trillion, two hundred billion, two hundred twenty-one million, twenty-one thousand, two hundred".