216021500 has 24 divisors (see below), whose sum is σ = 471792048. Its totient is φ = 86408400.

The previous prime is 216021473. The next prime is 216021511. The reversal of 216021500 is 5120612.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215522 + ... + 216521.

It is an arithmetic number, because the mean of its divisors is an integer number (19658002).

Almost surely, 2^216021500 is an apocalyptic number.

216021500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216021500 is an abundant number, since it is smaller than the sum of its proper divisors (255770548).

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

216021500 is a wasteful number, since it uses less digits than its factorization.

216021500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432062 (or 432050 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 216021500 is about 14697.6698833523. The cubic root of 216021500 is about 600.0199067469.

The spelling of 216021500 in words is "two hundred sixteen million, twenty-one thousand, five hundred".