216021533 has 32 divisors (see below), whose sum is σ = 283046400. Its totient is φ = 159989760.

The previous prime is 216021521. The next prime is 216021569. The reversal of 216021533 is 335120612.

It is not a de Polignac number, because 216021533 - 2⁴ = 216021517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216021499 and 216021508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216021593) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 480893 + ... + 481341.

It is an arithmetic number, because the mean of its divisors is an integer number (8845200).

Almost surely, 2^216021533 is an apocalyptic number.

It is an amenable number.

216021533 is a deficient number, since it is larger than the sum of its proper divisors (67024867).

216021533 is a wasteful number, since it uses less digits than its factorization.

216021533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 216021533 is about 14697.6710059791. The cubic root of 216021533 is about 600.0199373005.

The spelling of 216021533 in words is "two hundred sixteen million, twenty-one thousand, five hundred thirty-three".