216321545 has 8 divisors (see below), whose sum is σ = 283184640. Its totient is φ = 157324720.

The previous prime is 216321487. The next prime is 216321551. The reversal of 216321545 is 545123612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 216321545 - 2²⁰ = 215272969 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 1966505 + ... + 1966614.

It is an arithmetic number, because the mean of its divisors is an integer number (35398080).

Almost surely, 2^216321545 is an apocalyptic number.

It is an amenable number.

216321545 is a deficient number, since it is larger than the sum of its proper divisors (66863095).

216321545 is a wasteful number, since it uses less digits than its factorization.

216321545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3933135.

The product of its digits is 7200, while the sum is 29.

The square root of 216321545 is about 14707.8735716622. The cubic root of 216321545 is about 600.2975792384.

The spelling of 216321545 in words is "two hundred sixteen million, three hundred twenty-one thousand, five hundred forty-five".