121121111011 has 16 divisors (see below), whose sum is σ = 123188776128. Its totient is φ = 119064064000.

The previous prime is 121121110969. The next prime is 121121111047. The reversal of 121121111011 is 110111121121.

It is a cyclic number.

It is not a de Polignac number, because 121121111011 - 2¹⁷ = 121120979939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121121110982 and 121121111000.

It is not an unprimeable number, because it can be changed into a prime (121121111611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63313791 + ... + 63315703.

It is an arithmetic number, because the mean of its divisors is an integer number (7699298508).

Almost surely, 2^121121111011 is an apocalyptic number.

121121111011 is a deficient number, since it is larger than the sum of its proper divisors (2067665117).

121121111011 is a wasteful number, since it uses less digits than its factorization.

121121111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4142.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 121121111011 its reverse (110111121121), we get a palindrome (231232232132).

The spelling of 121121111011 in words is "one hundred twenty-one billion, one hundred twenty-one million, one hundred eleven thousand, eleven".