216712155 has 32 divisors (see below), whose sum is σ = 379024128. Its totient is φ = 104860800.

The previous prime is 216712127. The next prime is 216712169. The reversal of 216712155 is 551217612.

It is not a de Polignac number, because 216712155 - 2⁶ = 216712091 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108072 + ... + 110058.

It is an arithmetic number, because the mean of its divisors is an integer number (11844504).

Almost surely, 2^216712155 is an apocalyptic number.

216712155 is a deficient number, since it is larger than the sum of its proper divisors (162311973).

216712155 is a wasteful number, since it uses less digits than its factorization.

216712155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2667.

The product of its digits is 4200, while the sum is 30.

The square root of 216712155 is about 14721.1465246427. The cubic root of 216712155 is about 600.6586794156.

Adding to 216712155 its reverse (551217612), we get a palindrome (767929767).

It can be divided in two parts, 21 and 6712155, that added together give a palindrome (6712176).

The spelling of 216712155 in words is "two hundred sixteen million, seven hundred twelve thousand, one hundred fifty-five".