121121211 has 4 divisors (see below), whose sum is σ = 161494952. Its totient is φ = 80747472.

The previous prime is 121121201. The next prime is 121121213. The reversal of 121121211 is 112121121.

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

It is not a de Polignac number, because 121121211 - 2⁵ = 121121179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121121213) 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, 20186866 + ... + 20186871.

It is an arithmetic number, because the mean of its divisors is an integer number (40373738).

Almost surely, 2^121121211 is an apocalyptic number.

121121211 is a deficient number, since it is larger than the sum of its proper divisors (40373741).

121121211 is an equidigital number, since it uses as much as digits as its factorization.

121121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40373740.

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

The square root of 121121211 is about 11005.5082118001. The cubic root of 121121211 is about 494.7738462885.

Adding to 121121211 its reverse (112121121), we get a palindrome (233242332).

It can be divided in two parts, 1211 and 21211, that added together give a palindrome (22422).

The spelling of 121121211 in words is "one hundred twenty-one million, one hundred twenty-one thousand, two hundred eleven".