221324465 has 8 divisors (see below), whose sum is σ = 265812840. Its totient is φ = 176910592.

The previous prime is 221324429. The next prime is 221324489. The reversal of 221324465 is 564423122.

It can be written as a sum of positive squares in 4 ways, for example, as 84621601 + 136702864 = 9199^2 + 11692^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 221324465 - 2⁶ = 221324401 is a prime.

It is a Curzon 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, 11864 + ... + 24153.

It is an arithmetic number, because the mean of its divisors is an integer number (33226605).

Almost surely, 2^221324465 is an apocalyptic number.

It is an amenable number.

221324465 is a deficient number, since it is larger than the sum of its proper divisors (44488375).

221324465 is a wasteful number, since it uses less digits than its factorization.

221324465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37251.

The product of its digits is 11520, while the sum is 29.

The square root of 221324465 is about 14876.9776836560. The cubic root of 221324465 is about 604.8900968317.

Adding to 221324465 its reverse (564423122), we get a palindrome (785747587).

The spelling of 221324465 in words is "two hundred twenty-one million, three hundred twenty-four thousand, four hundred sixty-five".