216826123 has 2 divisors, whose sum is σ = 216826124. Its totient is φ = 216826122.

The previous prime is 216826117. The next prime is 216826151. The reversal of 216826123 is 321628612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216826123 - 2⁹ = 216825611 is a prime.

It is a super-2 number, since 2×216826123² = 94027135230422258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (216826723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108413061 + 108413062.

It is an arithmetic number, because the mean of its divisors is an integer number (108413062).

Almost surely, 2^216826123 is an apocalyptic number.

216826123 is a deficient number, since it is larger than the sum of its proper divisors (1).

216826123 is an equidigital number, since it uses as much as digits as its factorization.

216826123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 31.

The square root of 216826123 is about 14725.0169100073. The cubic root of 216826123 is about 600.7639555773.

The spelling of 216826123 in words is "two hundred sixteen million, eight hundred twenty-six thousand, one hundred twenty-three".