221030643 has 8 divisors (see below), whose sum is σ = 295043328. Its totient is φ = 147185864.

The previous prime is 221030639. The next prime is 221030647. The reversal of 221030643 is 346030122.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (221030639) and next prime (221030647).

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 221030643 - 2² = 221030639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221030647) 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, 38871 + ... + 44192.

It is an arithmetic number, because the mean of its divisors is an integer number (36880416).

Almost surely, 2^221030643 is an apocalyptic number.

221030643 is a deficient number, since it is larger than the sum of its proper divisors (74012685).

221030643 is an equidigital number, since it uses as much as digits as its factorization.

221030643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83953.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 221030643 is about 14867.0993472163. The cubic root of 221030643 is about 604.6223018769.

Adding to 221030643 its reverse (346030122), we get a palindrome (567060765).

The spelling of 221030643 in words is "two hundred twenty-one million, thirty thousand, six hundred forty-three".