16721510447 has 2 divisors, whose sum is σ = 16721510448. Its totient is φ = 16721510446.

The previous prime is 16721510363. The next prime is 16721510467. The reversal of 16721510447 is 74401512761.

It is a strong prime.

It is an emirp because it is prime and its reverse (74401512761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16721510447 - 2¹⁶ = 16721444911 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16721510447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16721510467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8360755223 + 8360755224.

It is an arithmetic number, because the mean of its divisors is an integer number (8360755224).

Almost surely, 2^16721510447 is an apocalyptic number.

16721510447 is a deficient number, since it is larger than the sum of its proper divisors (1).

16721510447 is an equidigital number, since it uses as much as digits as its factorization.

16721510447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47040, while the sum is 38.

The spelling of 16721510447 in words is "sixteen billion, seven hundred twenty-one million, five hundred ten thousand, four hundred forty-seven".