[go: up one dir, main page]

Search a number
-
+
21242027 = 171249531
BaseRepresentation
bin101000100001…
…0000010101011
31110222012120202
41101002002223
520414221102
62035142415
7345361052
oct121020253
943865522
1021242027
1110a994a4
127144a0b
134529861
142b6d399
151ce8e02
hex14420ab

21242027 has 4 divisors (see below), whose sum is σ = 22491576. Its totient is φ = 19992480.

The previous prime is 21241991. The next prime is 21242047. The reversal of 21242027 is 72024212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21242027 - 26 = 21241963 is a prime.

It is a super-2 number, since 2×212420272 = 902447422137458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21242047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624749 + ... + 624782.

It is an arithmetic number, because the mean of its divisors is an integer number (5622894).

Almost surely, 221242027 is an apocalyptic number.

21242027 is a deficient number, since it is larger than the sum of its proper divisors (1249549).

21242027 is a wasteful number, since it uses less digits than its factorization.

21242027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249548.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 21242027 is about 4608.9073542435. The cubic root of 21242027 is about 276.9482671747.

Adding to 21242027 its reverse (72024212), we get a palindrome (93266239).

The spelling of 21242027 in words is "twenty-one million, two hundred forty-two thousand, twenty-seven".

Divisors: 1 17 1249531 21242027