121211221212011 has 16 divisors (see below), whose sum is σ = 139467483783936. Its totient is φ = 103191848997216.

The previous prime is 121211221212007. The next prime is 121211221212079. The reversal of 121211221212011 is 110212122112121.

It is a happy number.

It is not a de Polignac number, because 121211221212011 - 2² = 121211221212007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121211221212611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74060981 + ... + 75679926.

It is an arithmetic number, because the mean of its divisors is an integer number (8716717736496).

Almost surely, 2^{121211221212011} is an apocalyptic number.

121211221212011 is a deficient number, since it is larger than the sum of its proper divisors (18256262571925).

121211221212011 is a wasteful number, since it uses less digits than its factorization.

121211221212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149741698.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 121211221212011 its reverse (110212122112121), we get a palindrome (231423343324132).

The spelling of 121211221212011 in words is "one hundred twenty-one trillion, two hundred eleven billion, two hundred twenty-one million, two hundred twelve thousand, eleven".