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21123343 = 103205081
BaseRepresentation
bin101000010010…
…1000100001111
31110202011210001
41100211010033
520401421333
62032425131
7344355043
oct120450417
943664701
1021123343
1110a1830a
1270a81a7
1344b7827
142b3c023
151cc3b7d
hex142510f

21123343 has 4 divisors (see below), whose sum is σ = 21328528. Its totient is φ = 20918160.

The previous prime is 21123331. The next prime is 21123359. The reversal of 21123343 is 34332112.

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

It is a cyclic number.

It is not a de Polignac number, because 21123343 - 217 = 20992271 is a prime.

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 21123343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102438 + ... + 102643.

It is an arithmetic number, because the mean of its divisors is an integer number (5332132).

Almost surely, 221123343 is an apocalyptic number.

21123343 is a deficient number, since it is larger than the sum of its proper divisors (205185).

21123343 is a wasteful number, since it uses less digits than its factorization.

21123343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205184.

The product of its digits is 432, while the sum is 19.

The square root of 21123343 is about 4596.0138163413. The cubic root of 21123343 is about 276.4315127396.

Adding to 21123343 its reverse (34332112), we get a palindrome (55455455).

The spelling of 21123343 in words is "twenty-one million, one hundred twenty-three thousand, three hundred forty-three".

Divisors: 1 103 205081 21123343