121211111211 has 24 divisors (see below), whose sum is σ = 174197735424. Its totient is φ = 74925537840.

The previous prime is 121211111201. The next prime is 121211111227. The reversal of 121211111211 is 112111112121.

It is not a de Polignac number, because 121211111211 - 2¹³ = 121211103019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121211111201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1139755 + ... + 1241556.

It is an arithmetic number, because the mean of its divisors is an integer number (7258238976).

Almost surely, 2^121211111211 is an apocalyptic number.

121211111211 is a deficient number, since it is larger than the sum of its proper divisors (52986624213).

121211111211 is a wasteful number, since it uses less digits than its factorization.

121211111211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2381399 (or 2381380 counting only the distinct ones).

The product of its digits is 8, while the sum is 15.

Adding to 121211111211 its reverse (112111112121), we get a palindrome (233322223332).

It can be divided in two parts, 1 and 21211111211, that added together give a palindrome (21211111212).

The spelling of 121211111211 in words is "one hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, two hundred eleven".