1001211103 has 4 divisors (see below), whose sum is σ = 1025630928. Its totient is φ = 976791280.

The previous prime is 1001211089. The next prime is 1001211121. The reversal of 1001211103 is 3011121001.

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

It is a cyclic number.

It is not a de Polignac number, because 1001211103 - 2¹³ = 1001202911 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1001211103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001211163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12209851 + ... + 12209932.

It is an arithmetic number, because the mean of its divisors is an integer number (256407732).

Almost surely, 2^1001211103 is an apocalyptic number.

1001211103 is a deficient number, since it is larger than the sum of its proper divisors (24419825).

1001211103 is an equidigital number, since it uses as much as digits as its factorization.

1001211103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24419824.

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 1001211103 is about 31641.9200270780. The cubic root of 1001211103 is about 1000.4035381351.

Adding to 1001211103 its reverse (3011121001), we get a palindrome (4012332104).

It can be divided in two parts, 10012 and 11103, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 1001211103 in words is "one billion, one million, two hundred eleven thousand, one hundred three".