217996123 has 6 divisors (see below), whose sum is σ = 225256092. Its totient is φ = 210963060.

The previous prime is 217996099. The next prime is 217996153. The reversal of 217996123 is 321699712.

It is not a de Polignac number, because 217996123 - 2⁹ = 217995611 is a prime.

It is a super-2 number, since 2×217996123² = 95044619286062258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217996153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 112461 + ... + 114382.

It is an arithmetic number, because the mean of its divisors is an integer number (37542682).

Almost surely, 2^217996123 is an apocalyptic number.

217996123 is a deficient number, since it is larger than the sum of its proper divisors (7259969).

217996123 is an equidigital number, since it uses as much as digits as its factorization.

217996123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226905 (or 226874 counting only the distinct ones).

The product of its digits is 40824, while the sum is 40.

The square root of 217996123 is about 14764.6917678630. The cubic root of 217996123 is about 601.8425976344.

The spelling of 217996123 in words is "two hundred seventeen million, nine hundred ninety-six thousand, one hundred twenty-three".