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21433425 = 3521321989
BaseRepresentation
bin101000111000…
…0110001010001
31111022221010120
41101300301101
520441332200
62043220453
7350116056
oct121606121
944287116
1021433425
111110a282
127217729
134595a00
142bbd02d
151d359a0
hex1470c51

21433425 has 72 divisors (see below), whose sum is σ = 40845600. Its totient is φ = 9884160.

The previous prime is 21433421. The next prime is 21433427. The reversal of 21433425 is 52433412.

21433425 is nontrivially palindromic in base 8.

It is not a de Polignac number, because 21433425 - 22 = 21433421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21433395 and 21433404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433421) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 240781 + ... + 240869.

It is an arithmetic number, because the mean of its divisors is an integer number (567300).

Almost surely, 221433425 is an apocalyptic number.

21433425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21433425 is a deficient number, since it is larger than the sum of its proper divisors (19412175).

21433425 is a wasteful number, since it uses less digits than its factorization.

21433425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147 (or 129 counting only the distinct ones).

The product of its digits is 2880, while the sum is 24.

The square root of 21433425 is about 4629.6247148122. The cubic root of 21433425 is about 277.7775811850. Note that the first 3 decimals are identical.

Adding to 21433425 its reverse (52433412), we get a palindrome (73866837).

The spelling of 21433425 in words is "twenty-one million, four hundred thirty-three thousand, four hundred twenty-five".

Divisors: 1 3 5 13 15 19 25 39 57 65 75 89 95 169 195 247 267 285 325 445 475 507 741 845 975 1157 1235 1335 1425 1691 2225 2535 3211 3471 3705 4225 5073 5785 6175 6675 8455 9633 12675 15041 16055 17355 18525 21983 25365 28925 42275 45123 48165 65949 75205 80275 86775 109915 126825 225615 240825 285779 329745 376025 549575 857337 1128075 1428895 1648725 4286685 7144475 21433425