221200801 has 2 divisors, whose sum is σ = 221200802. Its totient is φ = 221200800.

The previous prime is 221200799. The next prime is 221200849. The reversal of 221200801 is 108002122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219010401 + 2190400 = 14799^2 + 1480^2 .

It is a cyclic number.

It is not a de Polignac number, because 221200801 - 2¹ = 221200799 is a prime.

Together with 221200799, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (221200871) by changing a digit.

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 as a sum of consecutive naturals, namely, 110600400 + 110600401.

It is an arithmetic number, because the mean of its divisors is an integer number (110600401).

Almost surely, 2^221200801 is an apocalyptic number.

It is an amenable number.

221200801 is a deficient number, since it is larger than the sum of its proper divisors (1).

221200801 is an equidigital number, since it uses as much as digits as its factorization.

221200801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 221200801 is about 14872.8208824016. The cubic root of 221200801 is about 604.7774160138. Note that the first 3 decimals are identical.

Adding to 221200801 its reverse (108002122), we get a palindrome (329202923).

The spelling of 221200801 in words is "two hundred twenty-one million, two hundred thousand, eight hundred one".