216522245 has 8 divisors (see below), whose sum is σ = 264086520. Its totient is φ = 170377920.

The previous prime is 216522227. The next prime is 216522277. The reversal of 216522245 is 542225612.

It can be written as a sum of positive squares in 4 ways, for example, as 7806436 + 208715809 = 2794^2 + 14447^2 .

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

It is not a de Polignac number, because 216522245 - 2⁸ = 216521989 is a prime.

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, 354650 + ... + 355259.

It is an arithmetic number, because the mean of its divisors is an integer number (33010815).

Almost surely, 2^216522245 is an apocalyptic number.

It is an amenable number.

216522245 is a deficient number, since it is larger than the sum of its proper divisors (47564275).

216522245 is an equidigital number, since it uses as much as digits as its factorization.

216522245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709975.

The product of its digits is 9600, while the sum is 29.

The square root of 216522245 is about 14714.6948660174. The cubic root of 216522245 is about 600.4831709904.

Adding to 216522245 its reverse (542225612), we get a palindrome (758747857).

The spelling of 216522245 in words is "two hundred sixteen million, five hundred twenty-two thousand, two hundred forty-five".