1212121220011 has 16 divisors (see below), whose sum is σ = 1308707642368. Its totient is φ = 1116013852800.

The previous prime is 1212121219999. The next prime is 1212121220041. The reversal of 1212121220011 is 1100221212121.

It is a cyclic number.

It is not a de Polignac number, because 1212121220011 - 2⁵ = 1212121219979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212121220041) 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 15 ways as a sum of consecutive naturals, for example, 34303525 + ... + 34338841.

It is an arithmetic number, because the mean of its divisors is an integer number (81794227648).

Almost surely, 2^{1212121220011} is an apocalyptic number.

1212121220011 is a deficient number, since it is larger than the sum of its proper divisors (96586422357).

1212121220011 is a wasteful number, since it uses less digits than its factorization.

1212121220011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42022.

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

Adding to 1212121220011 its reverse (1100221212121), we get a palindrome (2312342432132).

The spelling of 1212121220011 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twenty thousand, eleven".