216932221 has 8 divisors (see below), whose sum is σ = 243049824. Its totient is φ = 191880720.

The previous prime is 216932207. The next prime is 216932231. The reversal of 216932221 is 122239612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216932221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216932221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216932231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266095 + ... + 266908.

It is an arithmetic number, because the mean of its divisors is an integer number (30381228).

Almost surely, 2^216932221 is an apocalyptic number.

It is an amenable number.

216932221 is a deficient number, since it is larger than the sum of its proper divisors (26117603).

216932221 is a wasteful number, since it uses less digits than its factorization.

216932221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533051.

The product of its digits is 2592, while the sum is 28.

The square root of 216932221 is about 14728.6191138205. The cubic root of 216932221 is about 600.8619287976.

The spelling of 216932221 in words is "two hundred sixteen million, nine hundred thirty-two thousand, two hundred twenty-one".