216240023 has 2 divisors, whose sum is σ = 216240024. Its totient is φ = 216240022.

The previous prime is 216239999. The next prime is 216240047. The reversal of 216240023 is 320042612.

It is a balanced prime because it is at equal distance from previous prime (216239999) and next prime (216240047).

It is a cyclic number.

It is not a de Polignac number, because 216240023 - 2¹⁰ = 216238999 is a prime.

It is a super-3 number, since 3×216240023³ (a number of 26 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 216239977 and 216240004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216240523) 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 as a sum of consecutive naturals, namely, 108120011 + 108120012.

It is an arithmetic number, because the mean of its divisors is an integer number (108120012).

Almost surely, 2^216240023 is an apocalyptic number.

216240023 is a deficient number, since it is larger than the sum of its proper divisors (1).

216240023 is an equidigital number, since it uses as much as digits as its factorization.

216240023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 216240023 is about 14705.1019377630. The cubic root of 216240023 is about 600.2221612490. Note that the first 3 decimals are identical.

Adding to 216240023 its reverse (320042612), we get a palindrome (536282635).

The spelling of 216240023 in words is "two hundred sixteen million, two hundred forty thousand, twenty-three".