211431103 has 4 divisors (see below), whose sum is σ = 227695048. Its totient is φ = 195167160.

The previous prime is 211431089. The next prime is 211431109. The reversal of 211431103 is 301134112.

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 211431103 - 2⁵ = 211431071 is a prime.

It is a super-2 number, since 2×211431103² = 89406222631593218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211431109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8131953 + ... + 8131978.

It is an arithmetic number, because the mean of its divisors is an integer number (56923762).

Almost surely, 2^211431103 is an apocalyptic number.

211431103 is a deficient number, since it is larger than the sum of its proper divisors (16263945).

211431103 is a wasteful number, since it uses less digits than its factorization.

211431103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16263944.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 211431103 is about 14540.6706516584. The cubic root of 211431103 is about 595.7393562881.

Adding to 211431103 its reverse (301134112), we get a palindrome (512565215).

The spelling of 211431103 in words is "two hundred eleven million, four hundred thirty-one thousand, one hundred three".