216502123 has 4 divisors (see below), whose sum is σ = 229237560. Its totient is φ = 203766688.

The previous prime is 216502103. The next prime is 216502141. The reversal of 216502123 is 321205612.

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 216502123 - 2⁹ = 216501611 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216502094 and 216502103.

It is not an unprimeable number, because it can be changed into a prime (216502103) 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, 6367693 + ... + 6367726.

It is an arithmetic number, because the mean of its divisors is an integer number (57309390).

Almost surely, 2^216502123 is an apocalyptic number.

216502123 is a deficient number, since it is larger than the sum of its proper divisors (12735437).

216502123 is a wasteful number, since it uses less digits than its factorization.

216502123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12735436.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 216502123 is about 14714.0111118621. The cubic root of 216502123 is about 600.4645689038.

Adding to 216502123 its reverse (321205612), we get a palindrome (537707735).

The spelling of 216502123 in words is "two hundred sixteen million, five hundred two thousand, one hundred twenty-three".