121311211 has 8 divisors (see below), whose sum is σ = 141471200. Its totient is φ = 103980744.

The previous prime is 121311209. The next prime is 121311227. The reversal of 121311211 is 112113121.

It is a happy number.

It is not a de Polignac number, because 121311211 - 2¹ = 121311209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121311191 and 121311200.

It is not an unprimeable number, because it can be changed into a prime (121315211) 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, 176496 + ... + 177181.

It is an arithmetic number, because the mean of its divisors is an integer number (17683900).

Almost surely, 2^121311211 is an apocalyptic number.

121311211 is a deficient number, since it is larger than the sum of its proper divisors (20159989).

121311211 is an frugal number, since it uses more digits than its factorization.

121311211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353698 (or 353684 counting only the distinct ones).

The product of its digits is 12, while the sum is 13.

The square root of 121311211 is about 11014.1368704043. The cubic root of 121311211 is about 495.0324244992.

Adding to 121311211 its reverse (112113121), we get a palindrome (233424332).

The spelling of 121311211 in words is "one hundred twenty-one million, three hundred eleven thousand, two hundred eleven".