21044523320 has 16 divisors (see below), whose sum is σ = 47350177560. Its totient is φ = 8417809312.

The previous prime is 21044523307. The next prime is 21044523323. The reversal of 21044523320 is 2332544012.

It is a self number, because there is not a number n which added to its sum of digits gives 21044523320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044523323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263056502 + ... + 263056581.

Almost surely, 2^21044523320 is an apocalyptic number.

21044523320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21044523320 is an abundant number, since it is smaller than the sum of its proper divisors (26305654240).

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

21044523320 is a wasteful number, since it uses less digits than its factorization.

21044523320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526113094 (or 526113090 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The spelling of 21044523320 in words is "twenty-one billion, forty-four million, five hundred twenty-three thousand, three hundred twenty".