21628384128019 has 2 divisors, whose sum is σ = 21628384128020. Its totient is φ = 21628384128018.

The previous prime is 21628384127951. The next prime is 21628384128037. The reversal of 21628384128019 is 91082148382612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21628384128019 - 2³¹ = 21626236644371 is a prime.

It is a super-2 number, since 2×21628384128019² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21628384120019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10814192064009 + 10814192064010.

It is an arithmetic number, because the mean of its divisors is an integer number (10814192064010).

Almost surely, 2^{21628384128019} is an apocalyptic number.

21628384128019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21628384128019 is an equidigital number, since it uses as much as digits as its factorization.

21628384128019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2654208, while the sum is 55.

The spelling of 21628384128019 in words is "twenty-one trillion, six hundred twenty-eight billion, three hundred eighty-four million, one hundred twenty-eight thousand, nineteen".