221222321300 has 72 divisors (see below), whose sum is σ = 490514021760. Its totient is φ = 86562432000.

The previous prime is 221222321279. The next prime is 221222321357. The reversal of 221222321300 is 3123222122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10230500 + ... + 10252100.

Almost surely, 2^221222321300 is an apocalyptic number.

221222321300 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 221222321300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245257010880).

221222321300 is an abundant number, since it is smaller than the sum of its proper divisors (269291700460).

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

221222321300 is a wasteful number, since it uses less digits than its factorization.

221222321300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23841 (or 23834 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 221222321300 its reverse (3123222122), we get a palindrome (224345543422).

The spelling of 221222321300 in words is "two hundred twenty-one billion, two hundred twenty-two million, three hundred twenty-one thousand, three hundred".