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21032304 = 2432319051
BaseRepresentation
bin101000000111…
…0110101110000
31110120112220020
41100032311300
520341013204
62030443440
7343525446
oct120166560
943515806
1021032304
1110965977
127063580
134485267
142b16b96
151ca6bd9
hex140ed70

21032304 has 40 divisors (see below), whose sum is σ = 56698752. Its totient is φ = 6705600.

The previous prime is 21032299. The next prime is 21032309. The reversal of 21032304 is 40323012.

It is an interprime number because it is at equal distance from previous prime (21032299) and next prime (21032309).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8422 + ... + 10629.

Almost surely, 221032304 is an apocalyptic number.

21032304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21032304 is an abundant number, since it is smaller than the sum of its proper divisors (35666448).

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

21032304 is a wasteful number, since it uses less digits than its factorization.

21032304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19085 (or 19079 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 21032304 is about 4586.0989958787. The cubic root of 21032304 is about 276.0338122827.

Adding to 21032304 its reverse (40323012), we get a palindrome (61355316).

The spelling of 21032304 in words is "twenty-one million, thirty-two thousand, three hundred four".

Divisors: 1 2 3 4 6 8 12 16 23 24 46 48 69 92 138 184 276 368 552 1104 19051 38102 57153 76204 114306 152408 228612 304816 438173 457224 876346 914448 1314519 1752692 2629038 3505384 5258076 7010768 10516152 21032304