121311201211 has 4 divisors (see below), whose sum is σ = 121981429024. Its totient is φ = 120640973400.

The previous prime is 121311201203. The next prime is 121311201227. The reversal of 121311201211 is 112102113121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 121311201211 - 2³ = 121311201203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121311201281) 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, 335113635 + ... + 335113996.

It is an arithmetic number, because the mean of its divisors is an integer number (30495357256).

Almost surely, 2^121311201211 is an apocalyptic number.

121311201211 is a deficient number, since it is larger than the sum of its proper divisors (670227813).

121311201211 is an equidigital number, since it uses as much as digits as its factorization.

121311201211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670227812.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 121311201211 its reverse (112102113121), we get a palindrome (233413314332).

The spelling of 121311201211 in words is "one hundred twenty-one billion, three hundred eleven million, two hundred one thousand, two hundred eleven".