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21589872 = 243974637
BaseRepresentation
bin101001001011…
…0111101110000
31111121212201220
41102112331300
521011333442
62050425040
7351340143
oct122267560
944555656
1021589872
1111206877
127292180
13461bc95
142c2005a
151d66eec
hex1496f70

21589872 has 40 divisors (see below), whose sum is σ = 56360976. Its totient is φ = 7120896.

The previous prime is 21589859. The next prime is 21589937. The reversal of 21589872 is 27898512.

It is a super-2 number, since 2×215898722 = 932245145952768, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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, 2338 + ... + 6974.

Almost surely, 221589872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21589872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28180488).

21589872 is an abundant number, since it is smaller than the sum of its proper divisors (34771104).

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

21589872 is a wasteful number, since it uses less digits than its factorization.

21589872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4745 (or 4739 counting only the distinct ones).

The product of its digits is 80640, while the sum is 42.

The square root of 21589872 is about 4646.4902883790. The cubic root of 21589872 is about 278.4517954231.

The spelling of 21589872 in words is "twenty-one million, five hundred eighty-nine thousand, eight hundred seventy-two".

Divisors: 1 2 3 4 6 8 12 16 24 48 97 194 291 388 582 776 1164 1552 2328 4637 4656 9274 13911 18548 27822 37096 55644 74192 111288 222576 449789 899578 1349367 1799156 2698734 3598312 5397468 7196624 10794936 21589872