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21037729 is a prime number
BaseRepresentation
bin101000001000…
…0001010100001
31110120211100011
41100100022201
520341201404
62030524521
7343550326
oct120201241
943524304
1021037729
1110969a59
127066741
13448787b
142b18b4d
151ca8604
hex14102a1

21037729 has 2 divisors, whose sum is σ = 21037730. Its totient is φ = 21037728.

The previous prime is 21037727. The next prime is 21037739. The reversal of 21037729 is 92773012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13337104 + 7700625 = 3652^2 + 2775^2 .

It is a cyclic number.

It is not a de Polignac number, because 21037729 - 21 = 21037727 is a prime.

Together with 21037727, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21037729.

It is not a weakly prime, because it can be changed into another prime (21037727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10518864 + 10518865.

It is an arithmetic number, because the mean of its divisors is an integer number (10518865).

Almost surely, 221037729 is an apocalyptic number.

It is an amenable number.

21037729 is a deficient number, since it is larger than the sum of its proper divisors (1).

21037729 is an equidigital number, since it uses as much as digits as its factorization.

21037729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 21037729 is about 4586.6904190276. The cubic root of 21037729 is about 276.0575433125.

The spelling of 21037729 in words is "twenty-one million, thirty-seven thousand, seven hundred twenty-nine".