121111011 has 32 divisors (see below), whose sum is σ = 208550400. Its totient is φ = 68027040.

The previous prime is 121110991. The next prime is 121111021. The reversal of 121111011 is 110111121.

It is not a de Polignac number, because 121111011 - 2⁶ = 121110947 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 121110984 and 121111002.

It is not an unprimeable number, because it can be changed into a prime (121111021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5721 + ... + 16581.

It is an arithmetic number, because the mean of its divisors is an integer number (6517200).

Almost surely, 2^121111011 is an apocalyptic number.

121111011 is a deficient number, since it is larger than the sum of its proper divisors (87439389).

121111011 is a wasteful number, since it uses less digits than its factorization.

121111011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10936 (or 10930 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

The square root of 121111011 is about 11005.0447977280. The cubic root of 121111011 is about 494.7599570754.

Adding to 121111011 its reverse (110111121), we get a palindrome (231222132).

It can be divided in two parts, 1211110 and 11, that added together give a palindrome (1211121).

The spelling of 121111011 in words is "one hundred twenty-one million, one hundred eleven thousand, eleven".