1911113211121 has 2 divisors, whose sum is σ = 1911113211122. Its totient is φ = 1911113211120.

The previous prime is 1911113211103. The next prime is 1911113211229. The reversal of 1911113211121 is 1211123111191.

It is a m-pointer prime, because the next prime (1911113211229) can be obtained adding 1911113211121 to its product of digits (108).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1488046221025 + 423066990096 = 1219855^2 + 650436^2 .

It is a cyclic number.

It is not a de Polignac number, because 1911113211121 - 2⁹ = 1911113210609 is a prime.

It is not a weakly prime, because it can be changed into another prime (1911113211521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 955556605560 + 955556605561.

It is an arithmetic number, because the mean of its divisors is an integer number (955556605561).

Almost surely, 2^{1911113211121} is an apocalyptic number.

It is an amenable number.

1911113211121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1911113211121 is an equidigital number, since it uses as much as digits as its factorization.

1911113211121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108, while the sum is 25.

The spelling of 1911113211121 in words is "one trillion, nine hundred eleven billion, one hundred thirteen million, two hundred eleven thousand, one hundred twenty-one".