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21384533 is a prime number
BaseRepresentation
bin101000110010…
…0110101010101
31111020110001202
41101210311111
520433301113
62042202245
7346523402
oct121446525
944213052
1021384533
1111086575
1271b3385
134579691
142ba92a9
151d26258
hex1464d55

21384533 has 2 divisors, whose sum is σ = 21384534. Its totient is φ = 21384532.

The previous prime is 21384529. The next prime is 21384613. The reversal of 21384533 is 33548312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14922769 + 6461764 = 3863^2 + 2542^2 .

It is a cyclic number.

It is not a de Polignac number, because 21384533 - 22 = 21384529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21384496 and 21384505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21324533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10692266 + 10692267.

It is an arithmetic number, because the mean of its divisors is an integer number (10692267).

Almost surely, 221384533 is an apocalyptic number.

It is an amenable number.

21384533 is a deficient number, since it is larger than the sum of its proper divisors (1).

21384533 is an equidigital number, since it uses as much as digits as its factorization.

21384533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 29.

The square root of 21384533 is about 4624.3413585072. The cubic root of 21384533 is about 277.5662066417.

The spelling of 21384533 in words is "twenty-one million, three hundred eighty-four thousand, five hundred thirty-three".