2121121121111 has 2 divisors, whose sum is σ = 2121121121112. Its totient is φ = 2121121121110.

The previous prime is 2121121121107. The next prime is 2121121121123. The reversal of 2121121121111 is 1111211211212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121121121111 - 2² = 2121121121107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2121121121111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121121121011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060560560555 + 1060560560556.

It is an arithmetic number, because the mean of its divisors is an integer number (1060560560556).

Almost surely, 2^{2121121121111} is an apocalyptic number.

2121121121111 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121121121111 is an equidigital number, since it uses as much as digits as its factorization.

2121121121111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16, while the sum is 17.

Adding to 2121121121111 its reverse (1111211211212), we get a palindrome (3232332332323).

The spelling of 2121121121111 in words is "two trillion, one hundred twenty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred eleven".