2121204222 has 24 divisors (see below), whose sum is σ = 4641450840. Its totient is φ = 700066800.

The previous prime is 2121204203. The next prime is 2121204227. The reversal of 2121204222 is 2224021212.

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 = 2121204195 and 2121204204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121204227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 581572 + ... + 585207.

It is an arithmetic number, because the mean of its divisors is an integer number (193393785).

Almost surely, 2^2121204222 is an apocalyptic number.

2121204222 is an abundant number, since it is smaller than the sum of its proper divisors (2520246618).

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

2121204222 is a wasteful number, since it uses less digits than its factorization.

2121204222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1166888 (or 1166885 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 2121204222 is about 46056.5328916539. The cubic root of 2121204222 is about 1284.8748477889.

Adding to 2121204222 its reverse (2224021212), we get a palindrome (4345225434).

The spelling of 2121204222 in words is "two billion, one hundred twenty-one million, two hundred four thousand, two hundred twenty-two".