216683971 has 16 divisors (see below), whose sum is σ = 250937344. Its totient is φ = 183272544.

The previous prime is 216683947. The next prime is 216683983. The reversal of 216683971 is 179386612.

It is not a de Polignac number, because 216683971 - 2⁷ = 216683843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216683471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197701 + ... + 198793.

It is an arithmetic number, because the mean of its divisors is an integer number (15683584).

Almost surely, 2^216683971 is an apocalyptic number.

216683971 is a deficient number, since it is larger than the sum of its proper divisors (34253373).

216683971 is a wasteful number, since it uses less digits than its factorization.

216683971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450.

The product of its digits is 108864, while the sum is 43.

The square root of 216683971 is about 14720.1892311206. The cubic root of 216683971 is about 600.6326391931.

The spelling of 216683971 in words is "two hundred sixteen million, six hundred eighty-three thousand, nine hundred seventy-one".