216971807 has 8 divisors (see below), whose sum is σ = 234969840. Its totient is φ = 199160640.

The previous prime is 216971801. The next prime is 216971809. The reversal of 216971807 is 708179612.

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

It is a cyclic number.

It is not a de Polignac number, because 216971807 - 2⁴ = 216971791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216971801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44294 + ... + 48947.

It is an arithmetic number, because the mean of its divisors is an integer number (29371230).

Almost surely, 2^216971807 is an apocalyptic number.

216971807 is a deficient number, since it is larger than the sum of its proper divisors (17998033).

216971807 is a wasteful number, since it uses less digits than its factorization.

216971807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93433.

The product of its (nonzero) digits is 42336, while the sum is 41.

The square root of 216971807 is about 14729.9628987992. The cubic root of 216971807 is about 600.8984751953.

The spelling of 216971807 in words is "two hundred sixteen million, nine hundred seventy-one thousand, eight hundred seven".