2121222222 has 32 divisors (see below), whose sum is σ = 5387232000. Its totient is φ = 606063384.

The previous prime is 2121222193. The next prime is 2121222227. The reversal of 2121222222 is 2222221212.

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

It is a nude number because it is divisible by every one of its digits.

2121222222 is a modest number, since divided by 22222 gives 21212 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 2121222195 and 2121222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121222227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2805472 + ... + 2806227.

It is an arithmetic number, because the mean of its divisors is an integer number (168351000).

Almost surely, 2^2121222222 is an apocalyptic number.

2121222222 is an abundant number, since it is smaller than the sum of its proper divisors (3266009778).

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

2121222222 is a wasteful number, since it uses less digits than its factorization.

2121222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5611717 (or 5611711 counting only the distinct ones).

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

The square root of 2121222222 is about 46056.7283032566. The cubic root of 2121222222 is about 1284.8784821525.

Adding to 2121222222 its reverse (2222221212), we get a palindrome (4343443434).

It can be divided in two parts, 21212 and 22222, that added together give a palindrome (43434).

The spelling of 2121222222 in words is "two billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-two".