221065952447 has 2 divisors, whose sum is σ = 221065952448. Its totient is φ = 221065952446.

The previous prime is 221065952407. The next prime is 221065952461. The reversal of 221065952447 is 744259560122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221065952447 - 2⁶ = 221065952383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221065952407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110532976223 + 110532976224.

It is an arithmetic number, because the mean of its divisors is an integer number (110532976224).

Almost surely, 2^221065952447 is an apocalyptic number.

221065952447 is a deficient number, since it is larger than the sum of its proper divisors (1).

221065952447 is an equidigital number, since it uses as much as digits as its factorization.

221065952447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1209600, while the sum is 47.

The spelling of 221065952447 in words is "two hundred twenty-one billion, sixty-five million, nine hundred fifty-two thousand, four hundred forty-seven".