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21268329 = 37089443
BaseRepresentation
bin101000100100…
…0011101101001
31111000112122220
41101020131221
520421041304
62035504253
7345530535
oct121103551
944015586
1021268329
1111007235
127158089
134538814
142b78bc5
151d01ad9
hex1448769

21268329 has 4 divisors (see below), whose sum is σ = 28357776. Its totient is φ = 14178884.

The previous prime is 21268327. The next prime is 21268361. The reversal of 21268329 is 92386212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21268329 - 21 = 21268327 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21268329.

It is not an unprimeable number, because it can be changed into a prime (21268327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3544719 + ... + 3544724.

It is an arithmetic number, because the mean of its divisors is an integer number (7089444).

Almost surely, 221268329 is an apocalyptic number.

It is an amenable number.

21268329 is a deficient number, since it is larger than the sum of its proper divisors (7089447).

21268329 is an equidigital number, since it uses as much as digits as its factorization.

21268329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7089446.

The product of its digits is 10368, while the sum is 33.

The square root of 21268329 is about 4611.7598593162. The cubic root of 21268329 is about 277.0625263413.

The spelling of 21268329 in words is "twenty-one million, two hundred sixty-eight thousand, three hundred twenty-nine".

Divisors: 1 3 7089443 21268329