221330045 has 8 divisors (see below), whose sum is σ = 265822296. Its totient is φ = 176913216.

The previous prime is 221329991. The next prime is 221330047. The reversal of 221330045 is 540033122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 15665764 + 205664281 = 3958^2 + 14341^2 .

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 221330045 - 2⁶ = 221329981 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 221329999 and 221330026.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221330047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12182 + ... + 24311.

It is an arithmetic number, because the mean of its divisors is an integer number (33227787).

Almost surely, 2^221330045 is an apocalyptic number.

It is an amenable number.

221330045 is a deficient number, since it is larger than the sum of its proper divisors (44492251).

221330045 is a wasteful number, since it uses less digits than its factorization.

221330045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37711.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 221330045 is about 14877.1652205654. The cubic root of 221330045 is about 604.8951802558.

Adding to 221330045 its reverse (540033122), we get a palindrome (761363167).

The spelling of 221330045 in words is "two hundred twenty-one million, three hundred thirty thousand, forty-five".