1212111220011 has 32 divisors (see below), whose sum is σ = 1747566739200. Its totient is φ = 744691812480.

The previous prime is 1212111219911. The next prime is 1212111220039. The reversal of 1212111220011 is 1100221112121.

It is a happy number.

It is not a de Polignac number, because 1212111220011 - 2⁹ = 1212111219499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212111220511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10039996 + ... + 10160006.

It is an arithmetic number, because the mean of its divisors is an integer number (54611460600).

Almost surely, 2^{1212111220011} is an apocalyptic number.

1212111220011 is a deficient number, since it is larger than the sum of its proper divisors (535455519189).

1212111220011 is a wasteful number, since it uses less digits than its factorization.

1212111220011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124859.

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

Adding to 1212111220011 its reverse (1100221112121), we get a palindrome (2312332332132).

The spelling of 1212111220011 in words is "one trillion, two hundred twelve billion, one hundred eleven million, two hundred twenty thousand, eleven".