1212121222211 has 4 divisors (see below), whose sum is σ = 1212370583424. Its totient is φ = 1211871861000.

The previous prime is 1212121222199. The next prime is 1212121222229. The reversal of 1212121222211 is 1122221212121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1212121222211 - 2²² = 1212117027907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212121222241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124673315 + ... + 124683036.

It is an arithmetic number, because the mean of its divisors is an integer number (303092645856).

Almost surely, 2^{1212121222211} is an apocalyptic number.

1212121222211 is a deficient number, since it is larger than the sum of its proper divisors (249361213).

1212121222211 is an equidigital number, since it uses as much as digits as its factorization.

1212121222211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249361212.

The product of its digits is 128, while the sum is 20.

Adding to 1212121222211 its reverse (1122221212121), we get a palindrome (2334342434332).

The spelling of 1212121222211 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred eleven".