121211121 has 8 divisors (see below), whose sum is σ = 163184320. Its totient is φ = 80022672.

The previous prime is 121211113. The next prime is 121211137. The reversal of 121211121 is 121112121.

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

It is not a de Polignac number, because 121211121 - 2³ = 121211113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121211097 and 121211106.

It is not an unprimeable number, because it can be changed into a prime (121211021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195826 + ... + 196443.

It is an arithmetic number, because the mean of its divisors is an integer number (20398040).

Almost surely, 2^121211121 is an apocalyptic number.

It is an amenable number.

121211121 is a deficient number, since it is larger than the sum of its proper divisors (41973199).

121211121 is a wasteful number, since it uses less digits than its factorization.

121211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392375.

The product of its digits is 8, while the sum is 12.

The square root of 121211121 is about 11009.5922267812. The cubic root of 121211121 is about 494.8962418991.

Adding to 121211121 its reverse (121112121), we get a palindrome (242323242).

The spelling of 121211121 in words is "one hundred twenty-one million, two hundred eleven thousand, one hundred twenty-one".