128463364821 has 24 divisors (see below), whose sum is σ = 193359813472. Its totient is φ = 75752344800.

The previous prime is 128463364817. The next prime is 128463364867.

128463364821 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 128463364821 - 2² = 128463364817 is a prime.

It is a super-2 number, since 2×128463364821² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128463364811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4768915 + ... + 4795776.

Almost surely, 2^128463364821 is an apocalyptic number.

128463364821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128463364821 is a deficient number, since it is larger than the sum of its proper divisors (64896448651).

128463364821 is a wasteful number, since it uses less digits than its factorization.

128463364821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9564753 (or 9564742 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 48.

The spelling of 128463364821 in words is "one hundred twenty-eight billion, four hundred sixty-three million, three hundred sixty-four thousand, eight hundred twenty-one".