1211100030011 has 4 divisors (see below), whose sum is σ = 1239265147032. Its totient is φ = 1182934912992.

The previous prime is 1211100029999. The next prime is 1211100030061. The reversal of 1211100030011 is 1100300011121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211100030011 is a prime.

It is a super-3 number, since 3×1211100030011³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1211100029974 and 1211100030001.

It is not an unprimeable number, because it can be changed into a prime (1211100030061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14082558446 + ... + 14082558531.

It is an arithmetic number, because the mean of its divisors is an integer number (309816286758).

Almost surely, 2^{1211100030011} is an apocalyptic number.

1211100030011 is a deficient number, since it is larger than the sum of its proper divisors (28165117021).

1211100030011 is an equidigital number, since it uses as much as digits as its factorization.

1211100030011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28165117020.

The product of its (nonzero) digits is 6, while the sum is 11.

Adding to 1211100030011 its reverse (1100300011121), we get a palindrome (2311400041132).

The spelling of 1211100030011 in words is "one trillion, two hundred eleven billion, one hundred million, thirty thousand, eleven".