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21423632 = 244331139
BaseRepresentation
bin101000110111…
…0011000010000
31111022102200212
41101232120100
520441024012
62043103252
7350045366
oct121563020
944272625
1021423632
111110298a
127211b28
134591409
142bb9636
151d32b22
hex146e610

21423632 has 20 divisors (see below), whose sum is σ = 42474960. Its totient is φ = 10462368.

The previous prime is 21423631. The next prime is 21423641. The reversal of 21423632 is 23632412.

It is a junction number, because it is equal to n+sod(n) for n = 21423598 and 21423607.

It is not an unprimeable number, because it can be changed into a prime (21423631) 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, 14882 + ... + 16257.

It is an arithmetic number, because the mean of its divisors is an integer number (2123748).

Almost surely, 221423632 is an apocalyptic number.

It is an amenable number.

21423632 is a deficient number, since it is larger than the sum of its proper divisors (21051328).

21423632 is a wasteful number, since it uses less digits than its factorization.

21423632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31190 (or 31184 counting only the distinct ones).

The product of its digits is 1728, while the sum is 23.

The square root of 21423632 is about 4628.5669488514. The cubic root of 21423632 is about 277.7352689203.

The spelling of 21423632 in words is "twenty-one million, four hundred twenty-three thousand, six hundred thirty-two".

Divisors: 1 2 4 8 16 43 86 172 344 688 31139 62278 124556 249112 498224 1338977 2677954 5355908 10711816 21423632