121111010011111 has 4 divisors (see below), whose sum is σ = 121111099460352. Its totient is φ = 121110920561872.

The previous prime is 121111010011093. The next prime is 121111010011127. The reversal of 121111010011111 is 111110010111121.

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 121111010011111 - 2¹³ = 121111010002919 is a prime.

It is a super-2 number, since 2×121111010011111² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121111010011091 and 121111010011100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121115010011111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42661966 + ... + 45412171.

It is an arithmetic number, because the mean of its divisors is an integer number (30277774865088).

Almost surely, 2^{121111010011111} is an apocalyptic number.

121111010011111 is a deficient number, since it is larger than the sum of its proper divisors (89449241).

121111010011111 is an equidigital number, since it uses as much as digits as its factorization.

121111010011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89449240.

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

Adding to 121111010011111 its reverse (111110010111121), we get a palindrome (232221020122232).

The spelling of 121111010011111 in words is "one hundred twenty-one trillion, one hundred eleven billion, ten million, eleven thousand, one hundred eleven".