12122222211 has 32 divisors (see below), whose sum is σ = 19793491200. Its totient is φ = 7271043840.

The previous prime is 12122222209. The next prime is 12122222213. The reversal of 12122222211 is 11222222121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12122222209) and next prime (12122222213).

It is not a de Polignac number, because 12122222211 - 2¹ = 12122222209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12122222213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 181581 + ... + 239198.

It is an arithmetic number, because the mean of its divisors is an integer number (618546600).

Almost surely, 2^12122222211 is an apocalyptic number.

12122222211 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12122222211 is a deficient number, since it is larger than the sum of its proper divisors (7671268989).

12122222211 is a wasteful number, since it uses less digits than its factorization.

12122222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420896 (or 420890 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

Adding to 12122222211 its reverse (11222222121), we get a palindrome (23344444332).

It can be divided in two parts, 1 and 2122222211, that added together give a palindrome (2122222212).

The spelling of 12122222211 in words is "twelve billion, one hundred twenty-two million, two hundred twenty-two thousand, two hundred eleven".