1212211201111 has 2 divisors, whose sum is σ = 1212211201112. Its totient is φ = 1212211201110.

The previous prime is 1212211201081. The next prime is 1212211201151. The reversal of 1212211201111 is 1111021122121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1212211201111 - 2⁷ = 1212211200983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212211201151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606105600555 + 606105600556.

It is an arithmetic number, because the mean of its divisors is an integer number (606105600556).

Almost surely, 2^{1212211201111} is an apocalyptic number.

1212211201111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212211201111 is an equidigital number, since it uses as much as digits as its factorization.

1212211201111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 1212211201111 its reverse (1111021122121), we get a palindrome (2323232323232).

The spelling of 1212211201111 in words is "one trillion, two hundred twelve billion, two hundred eleven million, two hundred one thousand, one hundred eleven".