216123 has 8 divisors (see below), whose sum is σ = 293136. Its totient is φ = 141600.

The previous prime is 216119. The next prime is 216127. The reversal of 216123 is 321612.

It is an interprime number because it is at equal distance from previous prime (216119) and next prime (216127).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216123 - 2² = 216119 is a prime.

It is a super-2 number, since 2×216123² = 93418302258, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (216127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 408 + ... + 773.

It is an arithmetic number, because the mean of its divisors is an integer number (36642).

2²¹⁶¹²³ is an apocalyptic number.

216123 is a deficient number, since it is larger than the sum of its proper divisors (77013).

216123 is a wasteful number, since it uses less digits than its factorization.

216123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245.

The product of its digits is 72, while the sum is 15.

The square root of 216123 is about 464.8903096430. The cubic root of 216123 is about 60.0113867278.

Adding to 216123 its reverse (321612), we get a palindrome (537735).

The spelling of 216123 in words is "two hundred sixteen thousand, one hundred twenty-three".