12121222222 has 8 divisors (see below), whose sum is σ = 18254271672. Its totient is φ = 6036465000.

The previous prime is 12121222213. The next prime is 12121222279. The reversal of 12121222222 is 22222212121.

It is a sphenic number, since it is the product of 3 distinct primes.

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

It is a self number, because there is not a number n which added to its sum of digits gives 12121222222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12072429 + ... + 12073432.

It is an arithmetic number, because the mean of its divisors is an integer number (2281783959).

Almost surely, 2^12121222222 is an apocalyptic number.

12121222222 is a deficient number, since it is larger than the sum of its proper divisors (6133049450).

12121222222 is a wasteful number, since it uses less digits than its factorization.

12121222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24146114.

The product of its digits is 256, while the sum is 19.

Adding to 12121222222 its reverse (22222212121), we get a palindrome (34343434343).

The spelling of 12121222222 in words is "twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-two".