216231005 has 8 divisors (see below), whose sum is σ = 259705824. Its totient is φ = 172832400.

The previous prime is 216230969. The next prime is 216231011. The reversal of 216231005 is 500132612.

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

It is not a de Polignac number, because 216231005 - 2¹⁸ = 215968861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12611 + ... + 24320.

It is an arithmetic number, because the mean of its divisors is an integer number (32463228).

Almost surely, 2^216231005 is an apocalyptic number.

It is an amenable number.

216231005 is a deficient number, since it is larger than the sum of its proper divisors (43474819).

216231005 is a wasteful number, since it uses less digits than its factorization.

216231005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38107.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 216231005 is about 14704.7953062938. The cubic root of 216231005 is about 600.2138173131.

Adding to 216231005 its reverse (500132612), we get a palindrome (716363617).

The spelling of 216231005 in words is "two hundred sixteen million, two hundred thirty-one thousand, five".