128334433821 has 8 divisors (see below), whose sum is σ = 186668267424. Its totient is φ = 77778444720.

The previous prime is 128334433813. The next prime is 128334433841.

128334433821 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128334433821 - 2³ = 128334433813 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128334433841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1944461086 + ... + 1944461151.

It is an arithmetic number, because the mean of its divisors is an integer number (23333533428).

Almost surely, 2^128334433821 is an apocalyptic number.

128334433821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128334433821 is a deficient number, since it is larger than the sum of its proper divisors (58333833603).

128334433821 is a wasteful number, since it uses less digits than its factorization.

128334433821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3888922251.

The product of its digits is 331776, while the sum is 42.

The spelling of 128334433821 in words is "one hundred twenty-eight billion, three hundred thirty-four million, four hundred thirty-three thousand, eight hundred twenty-one".