121212011211 has 32 divisors (see below), whose sum is σ = 170445215808. Its totient is φ = 76537405440.

The previous prime is 121212011177. The next prime is 121212011231. The reversal of 121212011211 is 112110212121.

It is a happy number.

It is not a de Polignac number, because 121212011211 - 2⁶ = 121212011147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121212011231) 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 31 ways as a sum of consecutive naturals, for example, 564511 + ... + 749063.

It is an arithmetic number, because the mean of its divisors is an integer number (5326412994).

Almost surely, 2^121212011211 is an apocalyptic number.

121212011211 is a deficient number, since it is larger than the sum of its proper divisors (49233204597).

121212011211 is a wasteful number, since it uses less digits than its factorization.

121212011211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184751.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 121212011211 its reverse (112110212121), we get a palindrome (233322223332).

The spelling of 121212011211 in words is "one hundred twenty-one billion, two hundred twelve million, eleven thousand, two hundred eleven".