2123121121111 has 2 divisors, whose sum is σ = 2123121121112. Its totient is φ = 2123121121110.

The previous prime is 2123121121091. The next prime is 2123121121159. The reversal of 2123121121111 is 1111211213212.

It is a m-pointer prime, because the next prime (2123121121159) can be obtained adding 2123121121111 to its product of digits (48).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2123121121111 - 2¹⁹ = 2123120596823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2123121121171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061560560555 + 1061560560556.

It is an arithmetic number, because the mean of its divisors is an integer number (1061560560556).

Almost surely, 2^{2123121121111} is an apocalyptic number.

2123121121111 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123121121111 is an equidigital number, since it uses as much as digits as its factorization.

2123121121111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48, while the sum is 19.

Adding to 2123121121111 its reverse (1111211213212), we get a palindrome (3234332334323).

The spelling of 2123121121111 in words is "two trillion, one hundred twenty-three billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred eleven".