216056420 has 12 divisors (see below), whose sum is σ = 453718524. Its totient is φ = 86422560.

The previous prime is 216056333. The next prime is 216056437. The reversal of 216056420 is 24650612.

216056420 is digitally balanced in base 3, 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 2 ways, for example, as 48664576 + 167391844 = 6976^2 + 12938^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 216056420.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5401391 + ... + 5401430.

It is an arithmetic number, because the mean of its divisors is an integer number (37809877).

Almost surely, 2^216056420 is an apocalyptic number.

216056420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216056420 is an abundant number, since it is smaller than the sum of its proper divisors (237662104).

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

216056420 is a wasteful number, since it uses less digits than its factorization.

216056420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10802830 (or 10802828 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 216056420 is about 14698.8577787527. The cubic root of 216056420 is about 600.0522361929.

The spelling of 216056420 in words is "two hundred sixteen million, fifty-six thousand, four hundred twenty".