216811382 has 16 divisors (see below), whose sum is σ = 327731712. Its totient is φ = 107571240.

The previous prime is 216811369. The next prime is 216811391. The reversal of 216811382 is 283118612.

216811382 = 54² + 55² + ... + 866².

It is a congruent number.

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, 165743 + ... + 167045.

It is an arithmetic number, because the mean of its divisors is an integer number (20483232).

Almost surely, 2^216811382 is an apocalyptic number.

216811382 is a deficient number, since it is larger than the sum of its proper divisors (110920330).

216811382 is a wasteful number, since it uses less digits than its factorization.

216811382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1883.

The product of its digits is 4608, while the sum is 32.

The square root of 216811382 is about 14724.5163587807. The cubic root of 216811382 is about 600.7503408861.

Adding to 216811382 its reverse (283118612), we get a palindrome (499929994).

The spelling of 216811382 in words is "two hundred sixteen million, eight hundred eleven thousand, three hundred eighty-two".