216209105800 has 24 divisors (see below), whose sum is σ = 502686171450. Its totient is φ = 86483642240.

The previous prime is 216209105797. The next prime is 216209105869. The reversal of 216209105800 is 8501902612.

It can be written as a sum of positive squares in 3 ways, for example, as 165797181124 + 50411924676 = 407182^2 + 224526^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 540522565 + ... + 540522964.

Almost surely, 2^216209105800 is an apocalyptic number.

216209105800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216209105800 is an abundant number, since it is smaller than the sum of its proper divisors (286477065650).

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

216209105800 is a wasteful number, since it uses less digits than its factorization.

216209105800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081045545 (or 1081045536 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The spelling of 216209105800 in words is "two hundred sixteen billion, two hundred nine million, one hundred five thousand, eight hundred".