12111010101221 has 2 divisors, whose sum is σ = 12111010101222. Its totient is φ = 12111010101220.

The previous prime is 12111010101103. The next prime is 12111010101233. The reversal of 12111010101221 is 12210101011121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8016514509025 + 4094495592196 = 2831345^2 + 2023486^2 .

It is a cyclic number.

It is not a de Polignac number, because 12111010101221 - 2¹⁸ = 12111009839077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12111010101196 and 12111010101205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12111010101241) 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 as a sum of consecutive naturals, namely, 6055505050610 + 6055505050611.

It is an arithmetic number, because the mean of its divisors is an integer number (6055505050611).

Almost surely, 2^{12111010101221} is an apocalyptic number.

It is an amenable number.

12111010101221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111010101221 is an equidigital number, since it uses as much as digits as its factorization.

12111010101221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 12111010101221 its reverse (12210101011121), we get a palindrome (24321111112342).

The spelling of 12111010101221 in words is "twelve trillion, one hundred eleven billion, ten million, one hundred one thousand, two hundred twenty-one".