1211121100011 has 64 divisors (see below), whose sum is σ = 1754216386560. Its totient is φ = 741539473920.

The previous prime is 1211121100009. The next prime is 1211121100019. The reversal of 1211121100011 is 1100011211121.

It is not a de Polignac number, because 1211121100011 - 2¹ = 1211121100009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211121100011.

It is not an unprimeable number, because it can be changed into a prime (1211121100019) 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 63 ways as a sum of consecutive naturals, for example, 114370105 + ... + 114380693.

It is an arithmetic number, because the mean of its divisors is an integer number (27409631040).

Almost surely, 2^{1211121100011} is an apocalyptic number.

1211121100011 is a deficient number, since it is larger than the sum of its proper divisors (543095286549).

1211121100011 is a wasteful number, since it uses less digits than its factorization.

1211121100011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11476.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 1211121100011 its reverse (1100011211121), we get a palindrome (2311132311132).

The spelling of 1211121100011 in words is "one trillion, two hundred eleven billion, one hundred twenty-one million, one hundred thousand, eleven".