1211111001003 has 8 divisors (see below), whose sum is σ = 1614825090000. Its totient is φ = 807402123008.

The previous prime is 1211111000923. The next prime is 1211111001101. The reversal of 1211111001003 is 3001001111121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211111001003 - 2²⁶ = 1211043892139 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1211111001003.

It is not an unprimeable number, because it can be changed into a prime (1211111071003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 723678 + ... + 1716371.

It is an arithmetic number, because the mean of its divisors is an integer number (201853136250).

Almost surely, 2^{1211111001003} is an apocalyptic number.

1211111001003 is a deficient number, since it is larger than the sum of its proper divisors (403714088997).

1211111001003 is a wasteful number, since it uses less digits than its factorization.

1211111001003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2605501.

The product of its (nonzero) digits is 6, while the sum is 12.

Adding to 1211111001003 its reverse (3001001111121), we get a palindrome (4212112112124).

The spelling of 1211111001003 in words is "one trillion, two hundred eleven billion, one hundred eleven million, one thousand, three".