216021504 has 40 divisors (see below), whose sum is σ = 575498880. Its totient is φ = 72006656.

The previous prime is 216021473. The next prime is 216021511. The reversal of 216021504 is 405120612.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68784 + ... + 71855.

It is an arithmetic number, because the mean of its divisors is an integer number (14387472).

Almost surely, 2^216021504 is an apocalyptic number.

216021504 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

216021504 is an abundant number, since it is smaller than the sum of its proper divisors (359477376).

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

216021504 is an equidigital number, since it uses as much as digits as its factorization.

216021504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140660 (or 140644 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 216021504 is about 14697.6700194282. The cubic root of 216021504 is about 600.0199104504.

The spelling of 216021504 in words is "two hundred sixteen million, twenty-one thousand, five hundred four".