211020103 has 4 divisors (see below), whose sum is σ = 241165840. Its totient is φ = 180874368.

The previous prime is 211020091. The next prime is 211020107. The reversal of 211020103 is 301020112.

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 211020103 - 2¹⁷ = 210889031 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 211020103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211020107) 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, 15072858 + ... + 15072871.

It is an arithmetic number, because the mean of its divisors is an integer number (60291460).

Almost surely, 2^211020103 is an apocalyptic number.

211020103 is a deficient number, since it is larger than the sum of its proper divisors (30145737).

211020103 is an equidigital number, since it uses as much as digits as its factorization.

211020103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30145736.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 211020103 is about 14526.5310036498. The cubic root of 211020103 is about 595.3530875114.

Adding to 211020103 its reverse (301020112), we get a palindrome (512040215).

Subtracting 211020103 from its reverse (301020112), we obtain a palindrome (90000009).

The spelling of 211020103 in words is "two hundred eleven million, twenty thousand, one hundred three".