222121212320 has 48 divisors (see below), whose sum is σ = 599727276288. Its totient is φ = 76155843840.

The previous prime is 222121212317. The next prime is 222121212329. The reversal of 222121212320 is 23212121222.

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

It is a junction number, because it is equal to n+sod(n) for n = 222121212292 and 222121212301.

It is not an unprimeable number, because it can be changed into a prime (222121212329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99160136 + ... + 99162375.

It is an arithmetic number, because the mean of its divisors is an integer number (12494318256).

Almost surely, 2^222121212320 is an apocalyptic number.

222121212320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

222121212320 is an abundant number, since it is smaller than the sum of its proper divisors (377606063968).

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

222121212320 is a wasteful number, since it uses less digits than its factorization.

222121212320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198322533 (or 198322525 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 222121212320 its reverse (23212121222), we get a palindrome (245333333542).

The spelling of 222121212320 in words is "two hundred twenty-two billion, one hundred twenty-one million, two hundred twelve thousand, three hundred twenty".