21229732320 has 96 divisors (see below), whose sum is σ = 69781243392. Its totient is φ = 5415117312.

The previous prime is 21229732319. The next prime is 21229732393. The reversal of 21229732320 is 2323792212.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 950452 + ... + 972531.

It is an arithmetic number, because the mean of its divisors is an integer number (726887952).

Almost surely, 2^21229732320 is an apocalyptic number.

21229732320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21229732320 is an abundant number, since it is smaller than the sum of its proper divisors (48551511072).

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

21229732320 is a wasteful number, since it uses less digits than its factorization.

21229732320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1923024 (or 1923016 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 33.

The spelling of 21229732320 in words is "twenty-one billion, two hundred twenty-nine million, seven hundred thirty-two thousand, three hundred twenty".