121101011111 has 2 divisors, whose sum is σ = 121101011112. Its totient is φ = 121101011110.

The previous prime is 121101011107. The next prime is 121101011177. The reversal of 121101011111 is 111110101121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121101011111 - 2² = 121101011107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121101011092 and 121101011101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121101011411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60550505555 + 60550505556.

It is an arithmetic number, because the mean of its divisors is an integer number (60550505556).

Almost surely, 2^121101011111 is an apocalyptic number.

121101011111 is a deficient number, since it is larger than the sum of its proper divisors (1).

121101011111 is an equidigital number, since it uses as much as digits as its factorization.

121101011111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2, while the sum is 11.

Adding to 121101011111 its reverse (111110101121), we get a palindrome (232211112232).

The spelling of 121101011111 in words is "one hundred twenty-one billion, one hundred one million, eleven thousand, one hundred eleven".