211208107123 has 4 divisors (see below), whose sum is σ = 227454884608. Its totient is φ = 194961329640.

The previous prime is 211208107091. The next prime is 211208107147. The reversal of 211208107123 is 321701802112.

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 211208107123 - 2⁵ = 211208107091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211208107091 and 211208107100.

It is not an unprimeable number, because it can be changed into a prime (211208107153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8123388723 + ... + 8123388748.

It is an arithmetic number, because the mean of its divisors is an integer number (56863721152).

Almost surely, 2^211208107123 is an apocalyptic number.

211208107123 is a deficient number, since it is larger than the sum of its proper divisors (16246777485).

211208107123 is a wasteful number, since it uses less digits than its factorization.

211208107123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16246777484.

The product of its (nonzero) digits is 1344, while the sum is 28.

Adding to 211208107123 its reverse (321701802112), we get a palindrome (532909909235).

The spelling of 211208107123 in words is "two hundred eleven billion, two hundred eight million, one hundred seven thousand, one hundred twenty-three".