221916930517 has 2 divisors, whose sum is σ = 221916930518. Its totient is φ = 221916930516.

The previous prime is 221916930359. The next prime is 221916930539. The reversal of 221916930517 is 715039619122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157867950276 + 64048980241 = 397326^2 + 253079^2 .

It is a cyclic number.

It is not a de Polignac number, because 221916930517 - 2³⁵ = 187557192149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221916930317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110958465258 + 110958465259.

It is an arithmetic number, because the mean of its divisors is an integer number (110958465259).

Almost surely, 2^221916930517 is an apocalyptic number.

It is an amenable number.

221916930517 is a deficient number, since it is larger than the sum of its proper divisors (1).

221916930517 is an equidigital number, since it uses as much as digits as its factorization.

221916930517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 204120, while the sum is 46.

The spelling of 221916930517 in words is "two hundred twenty-one billion, nine hundred sixteen million, nine hundred thirty thousand, five hundred seventeen".