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21139535 = 525716451
BaseRepresentation
bin101000010100…
…1000001001111
31110202222222202
41100221001033
520402431120
62033032115
7344453204
oct120510117
943688882
1021139535
1110a2949a
1270b563b
1344c2001
142b43cab
151cc8875
hex142904f

21139535 has 8 divisors (see below), whose sum is σ = 25467696. Its totient is φ = 16844800.

The previous prime is 21139513. The next prime is 21139577. The reversal of 21139535 is 53593112.

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

It is not a de Polignac number, because 21139535 - 218 = 20877391 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21139498 and 21139507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6941 + ... + 9510.

It is an arithmetic number, because the mean of its divisors is an integer number (3183462).

Almost surely, 221139535 is an apocalyptic number.

21139535 is a deficient number, since it is larger than the sum of its proper divisors (4328161).

21139535 is a wasteful number, since it uses less digits than its factorization.

21139535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16713.

The product of its digits is 4050, while the sum is 29.

The square root of 21139535 is about 4597.7750053694. The cubic root of 21139535 is about 276.5021271284.

The spelling of 21139535 in words is "twenty-one million, one hundred thirty-nine thousand, five hundred thirty-five".

Divisors: 1 5 257 1285 16451 82255 4227907 21139535