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21343503 = 37114501
BaseRepresentation
bin101000101101…
…0110100001111
31111011100210010
41101122310033
520430443003
62041244303
7346262646
oct121326417
944140703
1021343503
1111058765
127193693
134563abc
142b9835d
151d19003
hex145ad0f

21343503 has 4 divisors (see below), whose sum is σ = 28458008. Its totient is φ = 14229000.

The previous prime is 21343501. The next prime is 21343513. The reversal of 21343503 is 30534312.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21343503 - 21 = 21343501 is a prime.

It is a super-2 number, since 2×213435032 = 911090240622018, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21343503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343501) 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 3 ways as a sum of consecutive naturals, for example, 3557248 + ... + 3557253.

It is an arithmetic number, because the mean of its divisors is an integer number (7114502).

Almost surely, 221343503 is an apocalyptic number.

21343503 is a deficient number, since it is larger than the sum of its proper divisors (7114505).

21343503 is an equidigital number, since it uses as much as digits as its factorization.

21343503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7114504.

The product of its (nonzero) digits is 1080, while the sum is 21.

The square root of 21343503 is about 4619.9029210580. The cubic root of 21343503 is about 277.3885730708.

Adding to 21343503 its reverse (30534312), we get a palindrome (51877815).

The spelling of 21343503 in words is "twenty-one million, three hundred forty-three thousand, five hundred three".

Divisors: 1 3 7114501 21343503