16721887038719 has 2 divisors, whose sum is σ = 16721887038720. Its totient is φ = 16721887038718.

The previous prime is 16721887038643. The next prime is 16721887038749. The reversal of 16721887038719 is 91783078812761.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16721887038719 is a prime.

It is a super-2 number, since 2×16721887038719² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16721887038749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8360943519359 + 8360943519360.

It is an arithmetic number, because the mean of its divisors is an integer number (8360943519360).

Almost surely, 2^{16721887038719} is an apocalyptic number.

16721887038719 is a deficient number, since it is larger than the sum of its proper divisors (1).

16721887038719 is an equidigital number, since it uses as much as digits as its factorization.

16721887038719 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56899584, while the sum is 68.

The spelling of 16721887038719 in words is "sixteen trillion, seven hundred twenty-one billion, eight hundred eighty-seven million, thirty-eight thousand, seven hundred nineteen".