121211220211 has 4 divisors (see below), whose sum is σ = 121212759832. Its totient is φ = 121209680592.

The previous prime is 121211220203. The next prime is 121211220223. The reversal of 121211220211 is 112022112121.

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 121211220211 - 2³ = 121211220203 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (121211520211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 644970 + ... + 811423.

It is an arithmetic number, because the mean of its divisors is an integer number (30303189958).

Almost surely, 2^121211220211 is an apocalyptic number.

121211220211 is a deficient number, since it is larger than the sum of its proper divisors (1539621).

121211220211 is an equidigital number, since it uses as much as digits as its factorization.

121211220211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1539620.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121211220211 its reverse (112022112121), we get a palindrome (233233332332).

The spelling of 121211220211 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred twenty thousand, two hundred eleven".