21025664184 has 64 divisors (see below), whose sum is σ = 60085117440. Its totient is φ = 6006153600.

The previous prime is 21025664183. The next prime is 21025664213. The reversal of 21025664184 is 48146652012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21025664183) 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 15 ways as a sum of consecutive naturals, for example, 1203109 + ... + 1220459.

It is an arithmetic number, because the mean of its divisors is an integer number (938829960).

Almost surely, 2^21025664184 is an apocalyptic number.

21025664184 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21025664184 is an abundant number, since it is smaller than the sum of its proper divisors (39059453256).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21025664184 is a wasteful number, since it uses less digits than its factorization.

21025664184 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24580 (or 24576 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 39.

The spelling of 21025664184 in words is "twenty-one billion, twenty-five million, six hundred sixty-four thousand, one hundred eighty-four".