211442123 has 4 divisors (see below), whose sum is σ = 211535088. Its totient is φ = 211349160.

The previous prime is 211442113. The next prime is 211442131. The reversal of 211442123 is 321244112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211442123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211442095 and 211442104.

It is not an unprimeable number, because it can be changed into a prime (211442113) 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, 42983 + ... + 47648.

It is an arithmetic number, because the mean of its divisors is an integer number (52883772).

Almost surely, 2^211442123 is an apocalyptic number.

211442123 is a deficient number, since it is larger than the sum of its proper divisors (92965).

211442123 is an equidigital number, since it uses as much as digits as its factorization.

211442123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92964.

The product of its digits is 384, while the sum is 20.

The square root of 211442123 is about 14541.0495838505. The cubic root of 211442123 is about 595.7497062848.

Adding to 211442123 its reverse (321244112), we get a palindrome (532686235).

The spelling of 211442123 in words is "two hundred eleven million, four hundred forty-two thousand, one hundred twenty-three".