216217100 has 36 divisors (see below), whose sum is σ = 511847448. Its totient is φ = 78624000.

The previous prime is 216217039. The next prime is 216217117. The reversal of 216217100 is 1712612.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97181 + ... + 99380.

Almost surely, 2^216217100 is an apocalyptic number.

216217100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216217100 is an abundant number, since it is smaller than the sum of its proper divisors (295630348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216217100 is a wasteful number, since it uses less digits than its factorization.

216217100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196586 (or 196579 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 216217100 is about 14704.3224937431. The cubic root of 216217100 is about 600.2009512087.

Adding to 216217100 its reverse (1712612), we get a palindrome (217929712).

The spelling of 216217100 in words is "two hundred sixteen million, two hundred seventeen thousand, one hundred".