216887122 has 16 divisors (see below), whose sum is σ = 345726360. Its totient is φ = 101691648.

The previous prime is 216887119. The next prime is 216887123. The reversal of 216887122 is 221788612.

It can be written as a sum of positive squares in 4 ways, for example, as 209699361 + 7187761 = 14481^2 + 2681^2 .

It is not an unprimeable number, because it can be changed into a prime (216887123) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2097 + ... + 20932.

Almost surely, 2^216887122 is an apocalyptic number.

216887122 is a deficient number, since it is larger than the sum of its proper divisors (128839238).

216887122 is a wasteful number, since it uses less digits than its factorization.

216887122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23325.

The product of its digits is 21504, while the sum is 37.

The square root of 216887122 is about 14727.0880353178. The cubic root of 216887122 is about 600.8202872961.

The spelling of 216887122 in words is "two hundred sixteen million, eight hundred eighty-seven thousand, one hundred twenty-two".