213247123 has 4 divisors (see below), whose sum is σ = 213804288. Its totient is φ = 212689960.

The previous prime is 213247103. The next prime is 213247129. The reversal of 213247123 is 321742312.

It is a happy number.

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 213247123 - 2⁹ = 213246611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213247129) 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, 278008 + ... + 278773.

It is an arithmetic number, because the mean of its divisors is an integer number (53451072).

Almost surely, 2^213247123 is an apocalyptic number.

213247123 is a deficient number, since it is larger than the sum of its proper divisors (557165).

213247123 is an equidigital number, since it uses as much as digits as its factorization.

213247123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557164.

The product of its digits is 2016, while the sum is 25.

The square root of 213247123 is about 14602.9833595742. The cubic root of 213247123 is about 597.4401338221.

Adding to 213247123 its reverse (321742312), we get a palindrome (534989435).

The spelling of 213247123 in words is "two hundred thirteen million, two hundred forty-seven thousand, one hundred twenty-three".