216021516 has 48 divisors (see below), whose sum is σ = 550932480. Its totient is φ = 65583360.

The previous prime is 216021511. The next prime is 216021517. The reversal of 216021516 is 615120612.

It is not an unprimeable number, because it can be changed into a prime (216021511) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 10756 + ... + 23403.

It is an arithmetic number, because the mean of its divisors is an integer number (11477760).

Almost surely, 2^216021516 is an apocalyptic number.

It is an amenable number.

216021516 is an abundant number, since it is smaller than the sum of its proper divisors (334910964).

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

216021516 is a wasteful number, since it uses less digits than its factorization.

216021516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34214 (or 34212 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 216021516 is about 14697.6704276562. The cubic root of 216021516 is about 600.0199215608.

The spelling of 216021516 in words is "two hundred sixteen million, twenty-one thousand, five hundred sixteen".