221332001801 has 2 divisors, whose sum is σ = 221332001802. Its totient is φ = 221332001800.

The previous prime is 221332001791. The next prime is 221332001827. The reversal of 221332001801 is 108100233122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216006505225 + 5325496576 = 464765^2 + 72976^2 .

It is a cyclic number.

It is not a de Polignac number, because 221332001801 - 2¹⁰ = 221332000777 is a prime.

It is not a weakly prime, because it can be changed into another prime (221332001881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110666000900 + 110666000901.

It is an arithmetic number, because the mean of its divisors is an integer number (110666000901).

Almost surely, 2^221332001801 is an apocalyptic number.

It is an amenable number.

221332001801 is a deficient number, since it is larger than the sum of its proper divisors (1).

221332001801 is an equidigital number, since it uses as much as digits as its factorization.

221332001801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 221332001801 its reverse (108100233122), we get a palindrome (329432234923).

The spelling of 221332001801 in words is "two hundred twenty-one billion, three hundred thirty-two million, one thousand, eight hundred one".