216412123 has 4 divisors (see below), whose sum is σ = 223874640. Its totient is φ = 208949608.

The previous prime is 216412117. The next prime is 216412153. The reversal of 216412123 is 321214612.

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-216412123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 216412094 and 216412103.

It is not an unprimeable number, because it can be changed into a prime (216412153) 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, 3731215 + ... + 3731272.

It is an arithmetic number, because the mean of its divisors is an integer number (55968660).

Almost surely, 2^216412123 is an apocalyptic number.

216412123 is a deficient number, since it is larger than the sum of its proper divisors (7462517).

216412123 is an equidigital number, since it uses as much as digits as its factorization.

216412123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7462516.

The product of its digits is 576, while the sum is 22.

The square root of 216412123 is about 14710.9524844586. The cubic root of 216412123 is about 600.3813529356.

Adding to 216412123 its reverse (321214612), we get a palindrome (537626735).

The spelling of 216412123 in words is "two hundred sixteen million, four hundred twelve thousand, one hundred twenty-three".