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21343211 = 173313793
BaseRepresentation
bin101000101101…
…0101111101011
31111011100101022
41101122233223
520430440321
62041243055
7346262051
oct121325753
944140338
1021343211
111105851a
12719348b
134563926
142b981d1
151d18dab
hex145abeb

21343211 has 8 divisors (see below), whose sum is σ = 22672944. Its totient is φ = 20021760.

The previous prime is 21343187. The next prime is 21343243. The reversal of 21343211 is 11234312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21343211 - 222 = 17148907 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 21343211.

It is not an unprimeable number, because it can be changed into a prime (21343261) 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, 3731 + ... + 7523.

It is an arithmetic number, because the mean of its divisors is an integer number (2834118).

Almost surely, 221343211 is an apocalyptic number.

21343211 is a deficient number, since it is larger than the sum of its proper divisors (1329733).

21343211 is a wasteful number, since it uses less digits than its factorization.

21343211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4141.

The product of its digits is 144, while the sum is 17.

The square root of 21343211 is about 4619.8713185542. The cubic root of 21343211 is about 277.3873080827.

Adding to 21343211 its reverse (11234312), we get a palindrome (32577523).

The spelling of 21343211 in words is "twenty-one million, three hundred forty-three thousand, two hundred eleven".

Divisors: 1 17 331 3793 5627 64481 1255483 21343211