212121222030 has 96 divisors (see below), whose sum is σ = 564051945600. Its totient is φ = 55283268096.

The previous prime is 212121222029. The next prime is 212121222041. The reversal of 212121222030 is 30222121212.

212121222030 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 212121221994 and 212121222012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2963706 + ... + 3034434.

It is an arithmetic number, because the mean of its divisors is an integer number (5875541100).

Almost surely, 2^212121222030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212121222030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (282025972800).

212121222030 is an abundant number, since it is smaller than the sum of its proper divisors (351930723570).

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

212121222030 is a wasteful number, since it uses less digits than its factorization.

212121222030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71498 (or 71495 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 212121222030 its reverse (30222121212), we get a palindrome (242343343242).

The spelling of 212121222030 in words is "two hundred twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, thirty".