216109056 has 104 divisors (see below), whose sum is σ = 591062560. Its totient is φ = 70189056.

The previous prime is 216109043. The next prime is 216109057. The reversal of 216109056 is 650901612.

It is a super-2 number, since 2×216109056² = 93406248170422272, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (216109057) 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, 528180 + ... + 528588.

Almost surely, 2^216109056 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216109056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (295531280).

216109056 is an abundant number, since it is smaller than the sum of its proper divisors (374953504).

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

216109056 is an equidigital number, since it uses as much as digits as its factorization.

216109056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 216109056 is about 14700.6481489763. The cubic root of 216109056 is about 600.1009607884.

The spelling of 216109056 in words is "two hundred sixteen million, one hundred nine thousand, fifty-six".