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21043828 = 2213499811
BaseRepresentation
bin101000001000…
…1101001110100
31110121010201001
41100101221310
520341400303
62031013044
7343604161
oct120215164
943533631
1021043828
11109735a3
12706a184
13448a590
142b1b068
151caa31d
hex1411a74

21043828 has 24 divisors (see below), whose sum is σ = 39788000. Its totient is φ = 9681120.

The previous prime is 21043817. The next prime is 21043871. The reversal of 21043828 is 82834012.

21043828 is a nontrivial binomial coefficient, being equal to C(6488, 2).

It is a junction number, because it is equal to n+sod(n) for n = 21043796 and 21043805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25543 + ... + 26353.

Almost surely, 221043828 is an apocalyptic number.

21043828 is the 6487-th triangular number and also the 3244-th hexagonal number.

21043828 is the 2163-rd centered nonagonal number.

It is an amenable number.

21043828 is a deficient number, since it is larger than the sum of its proper divisors (18744172).

21043828 is a wasteful number, since it uses less digits than its factorization.

21043828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1327 (or 1325 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 21043828 is about 4587.3552293233. The cubic root of 21043828 is about 276.0842178057.

The spelling of 21043828 in words is "twenty-one million, forty-three thousand, eight hundred twenty-eight".

Divisors: 1 2 4 13 26 52 499 811 998 1622 1996 3244 6487 10543 12974 21086 25948 42172 404689 809378 1618756 5260957 10521914 21043828