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21234545 = 510873907
BaseRepresentation
bin101000100000…
…0001101110001
31110221211022122
41101000031301
520414001140
62035044025
7345330203
oct121001561
943854278
1021234545
1110a93912
127140615
134526327
142b6a773
151ce6ab5
hex1440371

21234545 has 8 divisors (see below), whose sum is σ = 25511424. Its totient is φ = 16967664.

The previous prime is 21234541. The next prime is 21234593. The reversal of 21234545 is 54543212.

Adding to 21234545 its reverse (54543212), we get a palindrome (75777757).

It is a happy number.

21234545 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

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 21234545 - 22 = 21234541 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21234541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3482 + ... + 7388.

It is an arithmetic number, because the mean of its divisors is an integer number (3188928).

Almost surely, 221234545 is an apocalyptic number.

It is an amenable number.

21234545 is a deficient number, since it is larger than the sum of its proper divisors (4276879).

21234545 is a wasteful number, since it uses less digits than its factorization.

21234545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4999.

The product of its digits is 4800, while the sum is 26.

The square root of 21234545 is about 4608.0955936265. The cubic root of 21234545 is about 276.9157472043.

The spelling of 21234545 in words is "twenty-one million, two hundred thirty-four thousand, five hundred forty-five".

Divisors: 1 5 1087 3907 5435 19535 4246909 21234545