121121121111 has 8 divisors (see below), whose sum is σ = 161528485104. Its totient is φ = 80730585600.

The previous prime is 121121121103. The next prime is 121121121133. The reversal of 121121121111 is 111121121121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121121121111 - 2³ = 121121121103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121126111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4190316 + ... + 4219121.

It is an arithmetic number, because the mean of its divisors is an integer number (20191060638).

Almost surely, 2^121121121111 is an apocalyptic number.

121121121111 is a deficient number, since it is larger than the sum of its proper divisors (40407363993).

121121121111 is an equidigital number, since it uses as much as digits as its factorization.

121121121111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8414241.

The product of its digits is 8, while the sum is 15.

Adding to 121121121111 its reverse (111121121121), we get a palindrome (232242242232).

It can be divided in two parts, 121121121 and 111, that multiplied together give a palindrome (13444444431).

The spelling of 121121121111 in words is "one hundred twenty-one billion, one hundred twenty-one million, one hundred twenty-one thousand, one hundred eleven".