221443794017 has 2 divisors, whose sum is σ = 221443794018. Its totient is φ = 221443794016.

The previous prime is 221443794001. The next prime is 221443794037. The reversal of 221443794017 is 710497344122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 133165876561 + 88277917456 = 364919^2 + 297116^2 .

It is a cyclic number.

It is not a de Polignac number, because 221443794017 - 2⁴ = 221443794001 is a prime.

It is not a weakly prime, because it can be changed into another prime (221443794037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110721897008 + 110721897009.

It is an arithmetic number, because the mean of its divisors is an integer number (110721897009).

Almost surely, 2^221443794017 is an apocalyptic number.

It is an amenable number.

221443794017 is a deficient number, since it is larger than the sum of its proper divisors (1).

221443794017 is an equidigital number, since it uses as much as digits as its factorization.

221443794017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 44.

The spelling of 221443794017 in words is "two hundred twenty-one billion, four hundred forty-three million, seven hundred ninety-four thousand, seventeen".