12122221111211 has 8 divisors (see below), whose sum is σ = 12139772736000. Its totient is φ = 12104671898088.

The previous prime is 12122221111199. The next prime is 12122221111219. The reversal of 12122221111211 is 11211112222121.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12122221111211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12122221111219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9581720 + ... + 10772826.

It is an arithmetic number, because the mean of its divisors is an integer number (1517471592000).

Almost surely, 2^{12122221111211} is an apocalyptic number.

12122221111211 is a deficient number, since it is larger than the sum of its proper divisors (17551624789).

12122221111211 is a wasteful number, since it uses less digits than its factorization.

12122221111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205833.

The product of its digits is 64, while the sum is 20.

Adding to 12122221111211 its reverse (11211112222121), we get a palindrome (23333333333332).

The spelling of 12122221111211 in words is "twelve trillion, one hundred twenty-two billion, two hundred twenty-one million, one hundred eleven thousand, two hundred eleven".