121111011101011 has 4 divisors (see below), whose sum is σ = 121111069191112. Its totient is φ = 121110953010912.

The previous prime is 121111011100967. The next prime is 121111011101077. The reversal of 121111011101011 is 110101110111121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121111011101011 - 2¹⁹ = 121111010576723 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121111011100982 and 121111011101000.

It is not an unprimeable number, because it can be changed into a prime (128111011101011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25796625 + ... + 30127858.

It is an arithmetic number, because the mean of its divisors is an integer number (30277767297778).

Almost surely, 2^{121111011101011} is an apocalyptic number.

121111011101011 is a deficient number, since it is larger than the sum of its proper divisors (58090101).

121111011101011 is an equidigital number, since it uses as much as digits as its factorization.

121111011101011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58090100.

The product of its (nonzero) digits is 2, while the sum is 13.

Adding to 121111011101011 its reverse (110101110111121), we get a palindrome (231212121212132).

The spelling of 121111011101011 in words is "one hundred twenty-one trillion, one hundred eleven billion, eleven million, one hundred one thousand, eleven".