221324242 has 8 divisors (see below), whose sum is σ = 332204796. Its totient is φ = 110589312.

The previous prime is 221324227. The next prime is 221324261. The reversal of 221324242 is 242423122.

It can be written as a sum of positive squares in 2 ways, for example, as 220789881 + 534361 = 14859^2 + 731^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 32523 + ... + 38734.

Almost surely, 2^221324242 is an apocalyptic number.

221324242 is a deficient number, since it is larger than the sum of its proper divisors (110880554).

221324242 is a wasteful number, since it uses less digits than its factorization.

221324242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72812.

The product of its digits is 1536, while the sum is 22.

The square root of 221324242 is about 14876.9701888523. The cubic root of 221324242 is about 604.8898936752.

Adding to 221324242 its reverse (242423122), we get a palindrome (463747364).

The spelling of 221324242 in words is "two hundred twenty-one million, three hundred twenty-four thousand, two hundred forty-two".