21129095528 has 32 divisors (see below), whose sum is σ = 40947500160. Its totient is φ = 10215179520.

The previous prime is 21129095527. The next prime is 21129095531. The reversal of 21129095528 is 82559092112.

It is not an unprimeable number, because it can be changed into a prime (21129095527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307313 + ... + 369728.

It is an arithmetic number, because the mean of its divisors is an integer number (1279609380).

Almost surely, 2^21129095528 is an apocalyptic number.

It is an amenable number.

21129095528 is a deficient number, since it is larger than the sum of its proper divisors (19818404632).

21129095528 is a wasteful number, since it uses less digits than its factorization.

21129095528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677177 (or 677173 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 44.

The spelling of 21129095528 in words is "twenty-one billion, one hundred twenty-nine million, ninety-five thousand, five hundred twenty-eight".