21743064 has 72 divisors (see below), whose sum is σ = 68512860. Its totient is φ = 6211296.

The previous prime is 21743063. The next prime is 21743077. The reversal of 21743064 is 46034712.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21743063) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 447 + ... + 6609.

Almost surely, 2^21743064 is an apocalyptic number.

21743064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21743064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34256430).

21743064 is an abundant number, since it is smaller than the sum of its proper divisors (46769796).

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

21743064 is a wasteful number, since it uses less digits than its factorization.

21743064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6189 (or 6175 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 21743064 is about 4662.9458499965. The cubic root of 21743064 is about 279.1088333256.

Adding to 21743064 its reverse (46034712), we get a palindrome (67777776).

The spelling of 21743064 in words is "twenty-one million, seven hundred forty-three thousand, sixty-four".