88128021 has 4 divisors (see below), whose sum is σ = 117504032. Its totient is φ = 58752012.

The previous prime is 88128011. The next prime is 88128031. The reversal of 88128021 is 12082188.

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 an interprime number because it is at equal distance from previous prime (88128011) and next prime (88128031).

It is not a de Polignac number, because 88128021 - 2⁶ = 88127957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 88128021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (88128011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14688001 + ... + 14688006.

It is an arithmetic number, because the mean of its divisors is an integer number (29376008).

Almost surely, 2^88128021 is an apocalyptic number.

It is an amenable number.

88128021 is a deficient number, since it is larger than the sum of its proper divisors (29376011).

88128021 is a wasteful number, since it uses less digits than its factorization.

88128021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29376010.

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 88128021 is about 9387.6525819824. The cubic root of 88128021 is about 445.0116076592.

The spelling of 88128021 in words is "eighty-eight million, one hundred twenty-eight thousand, twenty-one".