216711172 has 24 divisors (see below), whose sum is σ = 410102784. Its totient is φ = 99810432.

The previous prime is 216711167. The next prime is 216711191. The reversal of 216711172 is 271117612.

It is a super-2 number, since 2×216711172² = 93927464139227168, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 216711172.

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, 30708 + ... + 37099.

It is an arithmetic number, because the mean of its divisors is an integer number (17087616).

Almost surely, 2^216711172 is an apocalyptic number.

It is an amenable number.

216711172 is a deficient number, since it is larger than the sum of its proper divisors (193391612).

216711172 is a wasteful number, since it uses less digits than its factorization.

216711172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67875 (or 67873 counting only the distinct ones).

The product of its digits is 1176, while the sum is 28.

The square root of 216711172 is about 14721.1131372597. The cubic root of 216711172 is about 600.6577712241.

Adding to 216711172 its reverse (271117612), we get a palindrome (487828784).

The spelling of 216711172 in words is "two hundred sixteen million, seven hundred eleven thousand, one hundred seventy-two".