220000021200 has 180 divisors, whose sum is σ = 763656862540. Its totient is φ = 58651637760.

The previous prime is 220000021193. The next prime is 220000021217. The reversal of 220000021200 is 2120000022.

It can be written as a sum of positive squares in 6 ways, for example, as 335329344 + 219664691856 = 18312^2 + 468684^2 .

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 26524254 + ... + 26532546.

Almost surely, 2^220000021200 is an apocalyptic number.

220000021200 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 220000021200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (381828431270).

220000021200 is an abundant number, since it is smaller than the sum of its proper divisors (543656841340).

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

220000021200 is a wasteful number, since it uses less digits than its factorization.

220000021200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15686 (or 15672 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 220000021200 its reverse (2120000022), we get a palindrome (222120021222).

The spelling of 220000021200 in words is "two hundred twenty billion, twenty-one thousand, two hundred".