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21042570 = 235701419
BaseRepresentation
bin101000001000…
…1010110001010
31110121001222110
41100101112022
520341330240
62031003150
7343600413
oct120212612
943531873
1021042570
111097265a
1270694b6
134489b33
142b1a80a
151ca9c80
hex141158a

21042570 has 16 divisors (see below), whose sum is σ = 50502240. Its totient is φ = 5611344.

The previous prime is 21042563. The next prime is 21042577. The reversal of 21042570 is 7524012.

It is an interprime number because it is at equal distance from previous prime (21042563) and next prime (21042577).

It is not an unprimeable number, because it can be changed into a prime (21042577) 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, 350680 + ... + 350739.

It is an arithmetic number, because the mean of its divisors is an integer number (3156390).

Almost surely, 221042570 is an apocalyptic number.

21042570 is an abundant number, since it is smaller than the sum of its proper divisors (29459670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21042570 is a wasteful number, since it uses less digits than its factorization.

21042570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701429.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 21042570 is about 4587.2181112304. The cubic root of 21042570 is about 276.0787162580.

Adding to 21042570 its reverse (7524012), we get a palindrome (28566582).

It can be divided in two parts, 21042 and 570, that added together give a palindrome (21612).

The spelling of 21042570 in words is "twenty-one million, forty-two thousand, five hundred seventy".

Divisors: 1 2 3 5 6 10 15 30 701419 1402838 2104257 3507095 4208514 7014190 10521285 21042570