128005535604221 has 8 divisors (see below), whose sum is σ = 139649592989088. Its totient is φ = 116362676638000.

The previous prime is 128005535604203. The next prime is 128005535604269. The reversal of 128005535604221 is 122406535500821.

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

It is a cyclic number.

It is not a de Polignac number, because 128005535604221 - 2¹⁴ = 128005535587837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128005535607221) 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, 299381315 + ... + 299808576.

It is an arithmetic number, because the mean of its divisors is an integer number (17456199123636).

Almost surely, 2^{128005535604221} is an apocalyptic number.

128005535604221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128005535604221 is a deficient number, since it is larger than the sum of its proper divisors (11644057384867).

128005535604221 is a wasteful number, since it uses less digits than its factorization.

128005535604221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599209323.

The product of its (nonzero) digits is 576000, while the sum is 44.

The spelling of 128005535604221 in words is "one hundred twenty-eight trillion, five billion, five hundred thirty-five million, six hundred four thousand, two hundred twenty-one".