221021111001697 has 2 divisors, whose sum is σ = 221021111001698. Its totient is φ = 221021111001696.

The previous prime is 221021111001683. The next prime is 221021111001781. The reversal of 221021111001697 is 796100111120122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196104201845841 + 24916909155856 = 14003721^2 + 4991684^2 .

It is a cyclic number.

It is not a de Polignac number, because 221021111001697 - 2¹⁵ = 221021110968929 is a prime.

It is not a weakly prime, because it can be changed into another prime (221021111001667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110510555500848 + 110510555500849.

It is an arithmetic number, because the mean of its divisors is an integer number (110510555500849).

Almost surely, 2^{221021111001697} is an apocalyptic number.

It is an amenable number.

221021111001697 is a deficient number, since it is larger than the sum of its proper divisors (1).

221021111001697 is an equidigital number, since it uses as much as digits as its factorization.

221021111001697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 34.

The spelling of 221021111001697 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred eleven million, one thousand, six hundred ninety-seven".