216826881 has 8 divisors (see below), whose sum is σ = 299071680. Its totient is φ = 139566672.

The previous prime is 216826867. The next prime is 216826889. The reversal of 216826881 is 188628612.

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

It is not a de Polignac number, because 216826881 - 2²² = 212632577 is a prime.

It is a super-2 number, since 2×216826881² = 94027792648376322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (216826889) 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, 1246045 + ... + 1246218.

It is an arithmetic number, because the mean of its divisors is an integer number (37383960).

Almost surely, 2^216826881 is an apocalyptic number.

It is an amenable number.

216826881 is a deficient number, since it is larger than the sum of its proper divisors (82244799).

216826881 is a wasteful number, since it uses less digits than its factorization.

216826881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2492295.

The product of its digits is 73728, while the sum is 42.

The square root of 216826881 is about 14725.0426484951. The cubic root of 216826881 is about 600.7646556445.

The spelling of 216826881 in words is "two hundred sixteen million, eight hundred twenty-six thousand, eight hundred eighty-one".