121020111011111 has 16 divisors (see below), whose sum is σ = 130649697208800. Its totient is φ = 111436326617088.

The previous prime is 121020111010987. The next prime is 121020111011113. The reversal of 121020111011111 is 111110111020121.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121020111011111 is a prime.

It is a super-3 number, since 3×121020111011111³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121020111011113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76438535 + ... + 78005703.

It is an arithmetic number, because the mean of its divisors is an integer number (8165606075550).

Almost surely, 2^{121020111011111} is an apocalyptic number.

121020111011111 is a deficient number, since it is larger than the sum of its proper divisors (9629586197689).

121020111011111 is a wasteful number, since it uses less digits than its factorization.

121020111011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581778.

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 121020111011111 its reverse (111110111020121), we get a palindrome (232130222031232).

The spelling of 121020111011111 in words is "one hundred twenty-one trillion, twenty billion, one hundred eleven million, eleven thousand, one hundred eleven".