21529607884 has 12 divisors (see below), whose sum is σ = 39314936304. Its totient is φ = 10296768944.

The previous prime is 21529607863. The next prime is 21529607887. The reversal of 21529607884 is 48870692512.

It is not an unprimeable number, because it can be changed into a prime (21529607887) 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 3 ways as a sum of consecutive naturals, for example, 117008647 + ... + 117008830.

It is an arithmetic number, because the mean of its divisors is an integer number (3276244692).

Almost surely, 2^21529607884 is an apocalyptic number.

It is an amenable number.

21529607884 is a deficient number, since it is larger than the sum of its proper divisors (17785328420).

21529607884 is a wasteful number, since it uses less digits than its factorization.

21529607884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234017504 (or 234017502 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 52.

The spelling of 21529607884 in words is "twenty-one billion, five hundred twenty-nine million, six hundred seven thousand, eight hundred eighty-four".