216279971 has 8 divisors (see below), whose sum is σ = 226109184. Its totient is φ = 206486280.

The previous prime is 216279949. The next prime is 216279979. The reversal of 216279971 is 179972612.

216279971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216279971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216279979) 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, 3986 + ... + 21176.

It is an arithmetic number, because the mean of its divisors is an integer number (28263648).

Almost surely, 2^216279971 is an apocalyptic number.

216279971 is a deficient number, since it is larger than the sum of its proper divisors (9829213).

216279971 is a wasteful number, since it uses less digits than its factorization.

216279971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17761.

The product of its digits is 95256, while the sum is 44.

The square root of 216279971 is about 14706.4601791186. The cubic root of 216279971 is about 600.2591204856.

The spelling of 216279971 in words is "two hundred sixteen million, two hundred seventy-nine thousand, nine hundred seventy-one".