2123121222 has 24 divisors (see below), whose sum is σ = 4612443264. Its totient is φ = 705807504.

The previous prime is 2123121197. The next prime is 2123121241. The reversal of 2123121222 is 2221213212.

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.

It is a junction number, because it is equal to n+sod(n) for n = 2123121195 and 2123121204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 151398 + ... + 164825.

It is an arithmetic number, because the mean of its divisors is an integer number (192185136).

Almost surely, 2^2123121222 is an apocalyptic number.

2123121222 is an abundant number, since it is smaller than the sum of its proper divisors (2489322042).

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

2123121222 is a wasteful number, since it uses less digits than its factorization.

2123121222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316604 (or 316601 counting only the distinct ones).

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

The square root of 2123121222 is about 46077.3395716376. The cubic root of 2123121222 is about 1285.2617920593.

Adding to 2123121222 its reverse (2221213212), we get a palindrome (4344334434).

The spelling of 2123121222 in words is "two billion, one hundred twenty-three million, one hundred twenty-one thousand, two hundred twenty-two".