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21121303 = 72431047
BaseRepresentation
bin101000010010…
…0100100010111
31110202001222111
41100210210113
520401340203
62032411451
7344346100
oct120444427
943661874
1021121303
1110a16825
1270a6b87
1344b6918
142b3b3a7
151cc326d
hex1424917

21121303 has 6 divisors (see below), whose sum is σ = 24569736. Its totient is φ = 18103932.

The previous prime is 21121277. The next prime is 21121319. The reversal of 21121303 is 30312112.

It is not a de Polignac number, because 21121303 - 25 = 21121271 is a prime.

It is a super-2 number, since 2×211213032 = 892218880835618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121333) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 215475 + ... + 215572.

It is an arithmetic number, because the mean of its divisors is an integer number (4094956).

Almost surely, 221121303 is an apocalyptic number.

21121303 is a deficient number, since it is larger than the sum of its proper divisors (3448433).

21121303 is an equidigital number, since it uses as much as digits as its factorization.

21121303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431061 (or 431054 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21121303 is about 4595.7918795350. The cubic root of 21121303 is about 276.4226136047.

Adding to 21121303 its reverse (30312112), we get a palindrome (51433415).

The spelling of 21121303 in words is "twenty-one million, one hundred twenty-one thousand, three hundred three".

Divisors: 1 7 49 431047 3017329 21121303