121111311 has 4 divisors (see below), whose sum is σ = 161481752. Its totient is φ = 80740872.

The previous prime is 121111297. The next prime is 121111343. The reversal of 121111311 is 113111121.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 121111311 - 2¹⁵ = 121078543 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20185216 + ... + 20185221.

It is an arithmetic number, because the mean of its divisors is an integer number (40370438).

Almost surely, 2^121111311 is an apocalyptic number.

121111311 is a deficient number, since it is larger than the sum of its proper divisors (40370441).

121111311 is an equidigital number, since it uses as much as digits as its factorization.

121111311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40370440.

The product of its digits is 6, while the sum is 12.

The square root of 121111311 is about 11005.0584278322. The cubic root of 121111311 is about 494.7603655928.

Adding to 121111311 its reverse (113111121), we get a palindrome (234222432).

The spelling of 121111311 in words is "one hundred twenty-one million, one hundred eleven thousand, three hundred eleven".