216561104 has 10 divisors (see below), whose sum is σ = 419587170. Its totient is φ = 108280544.

The previous prime is 216561097. The next prime is 216561109. The reversal of 216561104 is 401165612.

216561104 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 147671104 + 68890000 = 12152^2 + 8300^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216561109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6767519 + ... + 6767550.

It is an arithmetic number, because the mean of its divisors is an integer number (41958717).

Almost surely, 2^216561104 is an apocalyptic number.

It is an amenable number.

216561104 is a deficient number, since it is larger than the sum of its proper divisors (203026066).

216561104 is a wasteful number, since it uses less digits than its factorization.

216561104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13535077 (or 13535071 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 216561104 is about 14716.0152215197. The cubic root of 216561104 is about 600.5190915179.

The spelling of 216561104 in words is "two hundred sixteen million, five hundred sixty-one thousand, one hundred four".