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21464481 = 313154617
BaseRepresentation
bin101000111100…
…0010110100001
31111101111201210
41101320112201
520443330411
62044020333
7350305443
oct121702641
944344653
1021464481
1111130645
1272316a9
1345a6b9c
142bca493
151d3eca6
hex14785a1

21464481 has 8 divisors (see below), whose sum is σ = 28838304. Its totient is φ = 14200160.

The previous prime is 21464473. The next prime is 21464491. The reversal of 21464481 is 18446412.

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

It is a cyclic number.

It is not a de Polignac number, because 21464481 - 23 = 21464473 is a prime.

It is a super-2 number, since 2×214644812 = 921447889198722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21464411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26916 + ... + 27701.

It is an arithmetic number, because the mean of its divisors is an integer number (3604788).

Almost surely, 221464481 is an apocalyptic number.

It is an amenable number.

21464481 is a deficient number, since it is larger than the sum of its proper divisors (7373823).

21464481 is a wasteful number, since it uses less digits than its factorization.

21464481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54751.

The product of its digits is 6144, while the sum is 30.

The square root of 21464481 is about 4632.9775522875. The cubic root of 21464481 is about 277.9116785489.

It can be divided in two parts, 21464 and 481, that added together give a triangular number (21945 = T209).

The spelling of 21464481 in words is "twenty-one million, four hundred sixty-four thousand, four hundred eighty-one".

Divisors: 1 3 131 393 54617 163851 7154827 21464481