221964663267629 has 2 divisors, whose sum is σ = 221964663267630. Its totient is φ = 221964663267628.

The previous prime is 221964663267617. The next prime is 221964663267647. The reversal of 221964663267629 is 926762366469122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 155553328298404 + 66411334969225 = 12472102^2 + 8149315^2 .

It is a cyclic number.

It is not a de Polignac number, because 221964663267629 - 2¹² = 221964663263533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221964663267329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110982331633814 + 110982331633815.

It is an arithmetic number, because the mean of its divisors is an integer number (110982331633815).

Almost surely, 2^{221964663267629} is an apocalyptic number.

It is an amenable number.

221964663267629 is a deficient number, since it is larger than the sum of its proper divisors (1).

221964663267629 is an equidigital number, since it uses as much as digits as its factorization.

221964663267629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846526464, while the sum is 71.

The spelling of 221964663267629 in words is "two hundred twenty-one trillion, nine hundred sixty-four billion, six hundred sixty-three million, two hundred sixty-seven thousand, six hundred twenty-nine".