1212122222211 has 4 divisors (see below), whose sum is σ = 1616162962952. Its totient is φ = 808081481472.

The previous prime is 1212122222123. The next prime is 1212122222237. The reversal of 1212122222211 is 1122222212121.

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

It is not a de Polignac number, because 1212122222211 - 2¹⁷ = 1212122091139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212122222291) 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, 202020370366 + ... + 202020370371.

It is an arithmetic number, because the mean of its divisors is an integer number (404040740738).

Almost surely, 2^{1212122222211} is an apocalyptic number.

1212122222211 is a deficient number, since it is larger than the sum of its proper divisors (404040740741).

1212122222211 is an equidigital number, since it uses as much as digits as its factorization.

1212122222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404040740740.

The product of its digits is 256, while the sum is 21.

Adding to 1212122222211 its reverse (1122222212121), we get a palindrome (2334344434332).

The spelling of 1212122222211 in words is "one trillion, two hundred twelve billion, one hundred twenty-two million, two hundred twenty-two thousand, two hundred eleven".