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21130303 = 171242959
BaseRepresentation
bin101000010011…
…0110000111111
31110202112022211
41100212300333
520402132203
62032521251
7344414245
oct120466077
943675284
1021130303
1110a22567
1270b0227
1344baa4c
142b40795
151cc5c6d
hex1426c3f

21130303 has 4 divisors (see below), whose sum is σ = 22373280. Its totient is φ = 19887328.

The previous prime is 21130301. The next prime is 21130321. The reversal of 21130303 is 30303112.

Adding to 21130303 its reverse (30303112), we get a palindrome (51433415).

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 21130303 - 21 = 21130301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130301) 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, 621463 + ... + 621496.

It is an arithmetic number, because the mean of its divisors is an integer number (5593320).

Almost surely, 221130303 is an apocalyptic number.

21130303 is a deficient number, since it is larger than the sum of its proper divisors (1242977).

21130303 is a wasteful number, since it uses less digits than its factorization.

21130303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242976.

The product of its (nonzero) digits is 54, while the sum is 13.

The square root of 21130303 is about 4596.7709318608. The cubic root of 21130303 is about 276.4618701828.

The spelling of 21130303 in words is "twenty-one million, one hundred thirty thousand, three hundred three".

Divisors: 1 17 1242959 21130303