1212211100121 has 16 divisors (see below), whose sum is σ = 1865112597504. Its totient is φ = 685966890384.

The previous prime is 1212211100081. The next prime is 1212211100197. The reversal of 1212211100121 is 1210011122121.

It is a happy number.

It is not a de Polignac number, because 1212211100121 - 2⁷ = 1212211099993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212211100121.

It is not an unprimeable number, because it can be changed into a prime (1212211500121) 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 15 ways as a sum of consecutive naturals, for example, 280213071 + ... + 280217396.

It is an arithmetic number, because the mean of its divisors is an integer number (116569537344).

Almost surely, 2^{1212211100121} is an apocalyptic number.

It is an amenable number.

1212211100121 is a deficient number, since it is larger than the sum of its proper divisors (652901497383).

1212211100121 is a wasteful number, since it uses less digits than its factorization.

1212211100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560430580.

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

Adding to 1212211100121 its reverse (1210011122121), we get a palindrome (2422222222242).

The spelling of 1212211100121 in words is "one trillion, two hundred twelve billion, two hundred eleven million, one hundred thousand, one hundred twenty-one".