21330754844 has 24 divisors (see below), whose sum is σ = 42667631328. Its totient is φ = 9140440320.

The previous prime is 21330754799. The next prime is 21330754849. The reversal of 21330754844 is 44845703312.

It is a super-2 number, since 2×21330754844² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330754849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158552 + ... + 260384.

It is an arithmetic number, because the mean of its divisors is an integer number (1777817972).

Almost surely, 2^21330754844 is an apocalyptic number.

It is an amenable number.

21330754844 is an abundant number, since it is smaller than the sum of its proper divisors (21336876484).

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

21330754844 is a wasteful number, since it uses less digits than its factorization.

21330754844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109325 (or 109323 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 41.

The spelling of 21330754844 in words is "twenty-one billion, three hundred thirty million, seven hundred fifty-four thousand, eight hundred forty-four".