121121101111 has 4 divisors (see below), whose sum is σ = 121121888392. Its totient is φ = 121120313832.

The previous prime is 121121101093. The next prime is 121121101139. The reversal of 121121101111 is 111101121121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 121121101111 - 2²³ = 121112712503 is a prime.

It is a super-2 number, since 2×121121101111² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121121101091 and 121121101100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121121101141) 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 3 ways as a sum of consecutive naturals, for example, 79080 + ... + 498493.

It is an arithmetic number, because the mean of its divisors is an integer number (30280472098).

Almost surely, 2^121121101111 is an apocalyptic number.

121121101111 is a deficient number, since it is larger than the sum of its proper divisors (787281).

121121101111 is an equidigital number, since it uses as much as digits as its factorization.

121121101111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787280.

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

Adding to 121121101111 its reverse (111101121121), we get a palindrome (232222222232).

The spelling of 121121101111 in words is "one hundred twenty-one billion, one hundred twenty-one million, one hundred one thousand, one hundred eleven".