211031103 has 4 divisors (see below), whose sum is σ = 281374808. Its totient is φ = 140687400.

The previous prime is 211031087. The next prime is 211031111. The reversal of 211031103 is 301130112.

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

It is not a de Polignac number, because 211031103 - 2⁴ = 211031087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211031123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35171848 + ... + 35171853.

It is an arithmetic number, because the mean of its divisors is an integer number (70343702).

Almost surely, 2^211031103 is an apocalyptic number.

211031103 is a deficient number, since it is larger than the sum of its proper divisors (70343705).

211031103 is an equidigital number, since it uses as much as digits as its factorization.

211031103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70343704.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 211031103 is about 14526.9096162949. The cubic root of 211031103 is about 595.3634321343.

Adding to 211031103 its reverse (301130112), we get a palindrome (512161215).

Subtracting 211031103 from its reverse (301130112), we obtain a palindrome (90099009).

The spelling of 211031103 in words is "two hundred eleven million, thirty-one thousand, one hundred three".