21383544 has 64 divisors (see below), whose sum is σ = 65802240. Its totient is φ = 5639040.

The previous prime is 21383503. The next prime is 21383573. The reversal of 21383544 is 44538312.

It is a super-3 number, since 3×21383544³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2712 + ... + 7079.

It is an arithmetic number, because the mean of its divisors is an integer number (1028160).

Almost surely, 2^21383544 is an apocalyptic number.

21383544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21383544 is an abundant number, since it is smaller than the sum of its proper divisors (44418696).

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

21383544 is a wasteful number, since it uses less digits than its factorization.

21383544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9820 (or 9816 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

The square root of 21383544 is about 4624.2344231235. The cubic root of 21383544 is about 277.5619275799.

The spelling of 21383544 in words is "twenty-one million, three hundred eighty-three thousand, five hundred forty-four".