221200021200100 has 72 divisors (see below), whose sum is σ = 480402452275200. Its totient is φ = 88406576294400.

The previous prime is 221200021200097. The next prime is 221200021200113. The reversal of 221200021200100 is 1002120002122.

It is a happy 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, 5187474780 + ... + 5187517420.

It is an arithmetic number, because the mean of its divisors is an integer number (6672256281600).

Almost surely, 2^{221200021200100} is an apocalyptic number.

221200021200100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221200021200100 is an abundant number, since it is smaller than the sum of its proper divisors (259202431075100).

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

221200021200100 is a wasteful number, since it uses less digits than its factorization.

221200021200100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84493 (or 84486 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 221200021200100 its reverse (1002120002122), we get a palindrome (222202141202222).

The spelling of 221200021200100 in words is "two hundred twenty-one trillion, two hundred billion, twenty-one million, two hundred thousand, one hundred".