221021010020071 has 2 divisors, whose sum is σ = 221021010020072. Its totient is φ = 221021010020070.

The previous prime is 221021010020059. The next prime is 221021010020087. The reversal of 221021010020071 is 170020010120122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221021010020071 - 2¹⁵ = 221021009987303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221021010020171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510505010035 + 110510505010036.

It is an arithmetic number, because the mean of its divisors is an integer number (110510505010036).

Almost surely, 2^{221021010020071} is an apocalyptic number.

221021010020071 is a deficient number, since it is larger than the sum of its proper divisors (1).

221021010020071 is an equidigital number, since it uses as much as digits as its factorization.

221021010020071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 221021010020071 its reverse (170020010120122), we get a palindrome (391041020140193).

The spelling of 221021010020071 in words is "two hundred twenty-one trillion, twenty-one billion, ten million, twenty thousand, seventy-one".