212221311330 has 96 divisors (see below), whose sum is σ = 593695967040. Its totient is φ = 48408769920.

The previous prime is 212221311317. The next prime is 212221311331. The reversal of 212221311330 is 33113122212.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 212221311297 and 212221311306.

It is not an unprimeable number, because it can be changed into a prime (212221311331) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 574756 + ... + 868784.

It is an arithmetic number, because the mean of its divisors is an integer number (6184332990).

Almost surely, 2^212221311330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212221311330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296847983520).

212221311330 is an abundant number, since it is smaller than the sum of its proper divisors (381474655710).

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

212221311330 is a wasteful number, since it uses less digits than its factorization.

212221311330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294544 (or 294537 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 212221311330 its reverse (33113122212), we get a palindrome (245334433542).

The spelling of 212221311330 in words is "two hundred twelve billion, two hundred twenty-one million, three hundred eleven thousand, three hundred thirty".