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21298927 = 1310915031
BaseRepresentation
bin101000100111…
…1111011101111
31111002002122011
41101033323233
520423031202
62040302051
7346015666
oct121177357
944062564
1021298927
1111028221
127171927
134549720
142b85ddd
151d0abd7
hex144feef

21298927 has 8 divisors (see below), whose sum is σ = 23149280. Its totient is φ = 19478880.

The previous prime is 21298903. The next prime is 21298931. The reversal of 21298927 is 72989212.

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 21298927 - 27 = 21298799 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21298927.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21298987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6099 + ... + 8932.

It is an arithmetic number, because the mean of its divisors is an integer number (2893660).

Almost surely, 221298927 is an apocalyptic number.

21298927 is a deficient number, since it is larger than the sum of its proper divisors (1850353).

21298927 is a wasteful number, since it uses less digits than its factorization.

21298927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15153.

The product of its digits is 36288, while the sum is 40.

The square root of 21298927 is about 4615.0760557113. The cubic root of 21298927 is about 277.1953293928.

The spelling of 21298927 in words is "twenty-one million, two hundred ninety-eight thousand, nine hundred twenty-seven".

Divisors: 1 13 109 1417 15031 195403 1638379 21298927