221210311801 has 2 divisors, whose sum is σ = 221210311802. Its totient is φ = 221210311800.

The previous prime is 221210311711. The next prime is 221210311831. The reversal of 221210311801 is 108113012122.

221210311801 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 203938044025 + 17272267776 = 451595^2 + 131424^2 .

It is a cyclic number.

It is not a de Polignac number, because 221210311801 - 2¹¹ = 221210309753 is a prime.

It is not a weakly prime, because it can be changed into another prime (221210311831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605155900 + 110605155901.

It is an arithmetic number, because the mean of its divisors is an integer number (110605155901).

Almost surely, 2^221210311801 is an apocalyptic number.

It is an amenable number.

221210311801 is a deficient number, since it is larger than the sum of its proper divisors (1).

221210311801 is an equidigital number, since it uses as much as digits as its factorization.

221210311801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 221210311801 its reverse (108113012122), we get a palindrome (329323323923).

The spelling of 221210311801 in words is "two hundred twenty-one billion, two hundred ten million, three hundred eleven thousand, eight hundred one".