Search a number
-
+
21003010 = 257300043
BaseRepresentation
bin101000000011…
…1101100000010
31110112001201021
41100013230002
520334044020
62030100054
7343344160
oct120075402
943461637
1021003010
1110945966
12704a62a
134474b22
142b0a230
151c9d1aa
hex1407b02

21003010 has 16 divisors (see below), whose sum is σ = 43206336. Its totient is φ = 7201008.

The previous prime is 21003001. The next prime is 21003011. The reversal of 21003010 is 1030012.

It is a super-2 number, since 2×210030102 = 882252858120200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a junction number, because it is equal to n+sod(n) for n = 21002984 and 21003002.

It is not an unprimeable number, because it can be changed into a prime (21003011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149952 + ... + 150091.

It is an arithmetic number, because the mean of its divisors is an integer number (2700396).

Almost surely, 221003010 is an apocalyptic number.

21003010 is an abundant number, since it is smaller than the sum of its proper divisors (22203326).

21003010 is a wasteful number, since it uses less digits than its factorization.

21003010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300057.

The product of its (nonzero) digits is 6, while the sum is 7.

The square root of 21003010 is about 4582.9041011132. The cubic root of 21003010 is about 275.9055985350.

Adding to 21003010 its reverse (1030012), we get a palindrome (22033022).

The spelling of 21003010 in words is "twenty-one million, three thousand, ten".

Divisors: 1 2 5 7 10 14 35 70 300043 600086 1500215 2100301 3000430 4200602 10501505 21003010