21043523320 has 32 divisors (see below), whose sum is σ = 47693545200. Its totient is φ = 8355966208.

The previous prime is 21043523311. The next prime is 21043523341. The reversal of 21043523320 is 2332534012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1914550 + ... + 1925509.

Almost surely, 2^21043523320 is an apocalyptic number.

21043523320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21043523320 is an abundant number, since it is smaller than the sum of its proper divisors (26650021880).

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

21043523320 is a wasteful number, since it uses less digits than its factorization.

21043523320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3840207 (or 3840203 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 25.

The spelling of 21043523320 in words is "twenty-one billion, forty-three million, five hundred twenty-three thousand, three hundred twenty".