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21323203 = 112517723
BaseRepresentation
bin101000101010…
…1110111000011
31111010022221021
41101111313003
520424320303
62041010311
7346146526
oct121256703
944108837
1021323203
1111044490
127183997
1345577a5
142b90bbd
151d12ebd
hex1455dc3

21323203 has 8 divisors (see below), whose sum is σ = 23357376. Its totient is φ = 19305000.

The previous prime is 21323191. The next prime is 21323209. The reversal of 21323203 is 30232312.

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

It is a de Polignac number, because none of the positive numbers 2k-21323203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21323209) 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 7 ways as a sum of consecutive naturals, for example, 1101 + ... + 6622.

It is an arithmetic number, because the mean of its divisors is an integer number (2919672).

Almost surely, 221323203 is an apocalyptic number.

21323203 is a deficient number, since it is larger than the sum of its proper divisors (2034173).

21323203 is a wasteful number, since it uses less digits than its factorization.

21323203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7985.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 21323203 is about 4617.7053825466. The cubic root of 21323203 is about 277.3006029095.

Adding to 21323203 its reverse (30232312), we get a palindrome (51555515).

It can be divided in two parts, 2132 and 3203, that added together give a palindrome (5335).

The spelling of 21323203 in words is "twenty-one million, three hundred twenty-three thousand, two hundred three".

Divisors: 1 11 251 2761 7723 84953 1938473 21323203