121211211212211 has 64 divisors (see below), whose sum is σ = 164173920768000. Its totient is φ = 79541930496000.

The previous prime is 121211211212173. The next prime is 121211211212213. The reversal of 121211211212211 is 112212112112121.

It is not a de Polignac number, because 121211211212211 - 2²³ = 121211202823603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121211211212213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26072531815 + ... + 26072536463.

It is an arithmetic number, because the mean of its divisors is an integer number (2565217512000).

Almost surely, 2^{121211211212211} is an apocalyptic number.

121211211212211 is a deficient number, since it is larger than the sum of its proper divisors (42962709555789).

121211211212211 is a wasteful number, since it uses less digits than its factorization.

121211211212211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6180.

The product of its digits is 64, while the sum is 21.

Adding to 121211211212211 its reverse (112212112112121), we get a palindrome (233423323324332).

The spelling of 121211211212211 in words is "one hundred twenty-one trillion, two hundred eleven billion, two hundred eleven million, two hundred twelve thousand, two hundred eleven".