Search a number
-
+
21001099 = 719269587
BaseRepresentation
bin101000000011…
…1001110001011
31110111222002111
41100013032023
520334013344
62030043151
7343335460
oct120071613
943458074
1021001099
1110944489
1270494b7
134473cb2
142b09667
151c9c834
hex140738b

21001099 has 16 divisors (see below), whose sum is σ = 25401600. Its totient is φ = 16961184.

The previous prime is 21001087. The next prime is 21001117. The reversal of 21001099 is 99010012.

It is a cyclic number.

It is not a de Polignac number, because 21001099 - 211 = 20999051 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21001049) 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 15 ways as a sum of consecutive naturals, for example, 35484 + ... + 36070.

It is an arithmetic number, because the mean of its divisors is an integer number (1587600).

Almost surely, 221001099 is an apocalyptic number.

21001099 is a deficient number, since it is larger than the sum of its proper divisors (4400501).

21001099 is a wasteful number, since it uses less digits than its factorization.

21001099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 882.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 21001099 is about 4582.6956041177. The cubic root of 21001099 is about 275.8972303441.

It can be divided in two parts, 2100109 and 9, that multiplied together give a palindrome (18900981).

The spelling of 21001099 in words is "twenty-one million, one thousand, ninety-nine".

Divisors: 1 7 19 133 269 587 1883 4109 5111 11153 35777 78071 157903 1105321 3000157 21001099