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21126838 = 259179041
BaseRepresentation
bin101000010010…
…1111010110110
31110202100120111
41100211322312
520402024323
62032453234
7344401165
oct120457266
943670514
1021126838
1110a1a9a7
1270aa21a
1344b92b5
142b3d3dc
151cc4c0d
hex1425eb6

21126838 has 8 divisors (see below), whose sum is σ = 32227560. Its totient is φ = 10384320.

The previous prime is 21126827. The next prime is 21126851. The reversal of 21126838 is 83862112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89403 + ... + 89638.

It is an arithmetic number, because the mean of its divisors is an integer number (4028445).

Almost surely, 221126838 is an apocalyptic number.

21126838 is a deficient number, since it is larger than the sum of its proper divisors (11100722).

21126838 is a wasteful number, since it uses less digits than its factorization.

21126838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179102.

The product of its digits is 4608, while the sum is 31.

The square root of 21126838 is about 4596.3940214042. The cubic root of 21126838 is about 276.4467577202.

The spelling of 21126838 in words is "twenty-one million, one hundred twenty-six thousand, eight hundred thirty-eight".

Divisors: 1 2 59 118 179041 358082 10563419 21126838