217323057 has 8 divisors (see below), whose sum is σ = 331158976. Its totient is φ = 124184592.

The previous prime is 217323049. The next prime is 217323059. The reversal of 217323057 is 750323712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 217323057 - 2³ = 217323049 is a prime.

It is a super-2 number, since 2×217323057² = 94458622207650498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217323059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5174338 + ... + 5174379.

It is an arithmetic number, because the mean of its divisors is an integer number (41394872).

Almost surely, 2^217323057 is an apocalyptic number.

It is an amenable number.

217323057 is a deficient number, since it is larger than the sum of its proper divisors (113835919).

217323057 is a wasteful number, since it uses less digits than its factorization.

217323057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10348727.

The product of its (nonzero) digits is 8820, while the sum is 30.

The square root of 217323057 is about 14741.8810536512. The cubic root of 217323057 is about 601.2225599976. Note that the first 3 decimals are identical.

Adding to 217323057 its reverse (750323712), we get a palindrome (967646769).

The spelling of 217323057 in words is "two hundred seventeen million, three hundred twenty-three thousand, fifty-seven".