12122212121211 has 32 divisors (see below), whose sum is σ = 16300144852992. Its totient is φ = 8013151946880.

The previous prime is 12122212121147. The next prime is 12122212121281. The reversal of 12122212121211 is 11212121222121.

It is not a de Polignac number, because 12122212121211 - 2⁶ = 12122212121147 is a prime.

It is a super-2 number, since 2×12122212121211² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12122212121281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1244192206 + ... + 1244201948.

It is an arithmetic number, because the mean of its divisors is an integer number (509379526656).

Almost surely, 2^{12122212121211} is an apocalyptic number.

12122212121211 is a deficient number, since it is larger than the sum of its proper divisors (4177932731781).

12122212121211 is a wasteful number, since it uses less digits than its factorization.

12122212121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16443.

The product of its digits is 128, while the sum is 21.

Adding to 12122212121211 its reverse (11212121222121), we get a palindrome (23334333343332).

The spelling of 12122212121211 in words is "twelve trillion, one hundred twenty-two billion, two hundred twelve million, one hundred twenty-one thousand, two hundred eleven".