213311123 has 4 divisors (see below), whose sum is σ = 213768360. Its totient is φ = 212853888.

The previous prime is 213311113. The next prime is 213311143. The reversal of 213311123 is 321113312.

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 213311123 - 2¹⁶ = 213245587 is a prime.

It is a super-2 number, since 2×213311123² = 91003270391042258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213311113) 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, 227918 + ... + 228851.

It is an arithmetic number, because the mean of its divisors is an integer number (53442090).

Almost surely, 2^213311123 is an apocalyptic number.

213311123 is a deficient number, since it is larger than the sum of its proper divisors (457237).

213311123 is an equidigital number, since it uses as much as digits as its factorization.

213311123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457236.

The product of its digits is 108, while the sum is 17.

The square root of 213311123 is about 14605.1745282280. The cubic root of 213311123 is about 597.4998960102.

Adding to 213311123 its reverse (321113312), we get a palindrome (534424435).

The spelling of 213311123 in words is "two hundred thirteen million, three hundred eleven thousand, one hundred twenty-three".