221043001 has 2 divisors, whose sum is σ = 221043002. Its totient is φ = 221043000.

The previous prime is 221042977. The next prime is 221043007. The reversal of 221043001 is 100340122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130507776 + 90535225 = 11424^2 + 9515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221043001 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221043007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110521500 + 110521501.

It is an arithmetic number, because the mean of its divisors is an integer number (110521501).

Almost surely, 2^221043001 is an apocalyptic number.

It is an amenable number.

221043001 is a deficient number, since it is larger than the sum of its proper divisors (1).

221043001 is an equidigital number, since it uses as much as digits as its factorization.

221043001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 221043001 is about 14867.5149571137. The cubic root of 221043001 is about 604.6335699724.

Adding to 221043001 its reverse (100340122), we get a palindrome (321383123).

The spelling of 221043001 in words is "two hundred twenty-one million, forty-three thousand, one".