128059921 has 4 divisors (see below), whose sum is σ = 139701744. Its totient is φ = 116418100.

The previous prime is 128059907. The next prime is 128059927. The reversal of 128059921 is 129950821.

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 128059921 - 2⁵ = 128059889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128059927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5820895 + ... + 5820916.

It is an arithmetic number, because the mean of its divisors is an integer number (34925436).

Almost surely, 2^128059921 is an apocalyptic number.

128059921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

128059921 is a deficient number, since it is larger than the sum of its proper divisors (11641823).

128059921 is a wasteful number, since it uses less digits than its factorization.

128059921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11641822.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 128059921 is about 11316.3563482245. The cubic root of 128059921 is about 504.0470490742.

The spelling of 128059921 in words is "one hundred twenty-eight million, fifty-nine thousand, nine hundred twenty-one".