216021834 has 48 divisors (see below), whose sum is σ = 536215680. Its totient is φ = 61570080.

The previous prime is 216021829. The next prime is 216021847. The reversal of 216021834 is 438120612.

216021834 is a `hidden beast` number, since 21 + 602 + 1 + 8 + 34 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 216021798 and 216021807.

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 23 ways as a sum of consecutive naturals, for example, 56227 + ... + 59945.

It is an arithmetic number, because the mean of its divisors is an integer number (11171160).

Almost surely, 2^216021834 is an apocalyptic number.

216021834 is an abundant number, since it is smaller than the sum of its proper divisors (320193846).

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

216021834 is a wasteful number, since it uses less digits than its factorization.

216021834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4195 (or 4192 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 216021834 is about 14697.6812456931. The cubic root of 216021834 is about 600.0202159855.

It can be divided in two parts, 21602 and 1834, that added together give a triangular number (23436 = T₂₁₆).

The spelling of 216021834 in words is "two hundred sixteen million, twenty-one thousand, eight hundred thirty-four".