128467764821 has 4 divisors (see below), whose sum is σ = 140146652544. Its totient is φ = 116788877100.

The previous prime is 128467764811. The next prime is 128467764827.

128467764821 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128467764821 - 2²² = 128463570517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128467764827) 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 3 ways as a sum of consecutive naturals, for example, 5839443845 + ... + 5839443866.

It is an arithmetic number, because the mean of its divisors is an integer number (35036663136).

Almost surely, 2^128467764821 is an apocalyptic number.

128467764821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128467764821 is a deficient number, since it is larger than the sum of its proper divisors (11678887723).

128467764821 is a wasteful number, since it uses less digits than its factorization.

128467764821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11678887722.

The product of its digits is 7225344, while the sum is 56.

The spelling of 128467764821 in words is "one hundred twenty-eight billion, four hundred sixty-seven million, seven hundred sixty-four thousand, eight hundred twenty-one".