1211001100011 has 8 divisors (see below), whose sum is σ = 1794075703760.
Its totient is φ = 807334066656.
The previous prime is 1211001099977. The next prime is 1211001100021. The reversal of 1211001100011 is 1100011001121.
Adding to 1211001100011 its reverse (1100011001121), we get a palindrome (2311012101132).
It is not a de Polignac number, because 1211001100011 - 26 = 1211001099947 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (9).
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 1211001099966 and 1211001100002.
It is not an unprimeable number, because it can be changed into a prime (1211001100021) 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 7 ways as a sum of consecutive naturals, for example, 22425946270 + ... + 22425946323.
It is an arithmetic number, because the mean of its divisors is an integer number (224259462970).
Almost surely, 21211001100011 is an apocalyptic number.
1211001100011 is a deficient number, since it is larger than the sum of its proper divisors (583074603749).
1211001100011 is an equidigital number, since it uses as much as digits as its factorization.
1211001100011 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 44851892602 (or 44851892596 counting only the distinct ones).
The product of its (nonzero) digits is 2, while the sum is 9.
The spelling of 1211001100011 in words is "one trillion, two hundred eleven billion, one million, one hundred thousand, eleven".