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21223330 = 252122333
BaseRepresentation
bin101000011110…
…1011110100010
31110221020221021
41100331132202
520413121310
62034520054
7345252412
oct120753642
943836837
1021223330
1110a86447
12713602a
1345211ab
142b66642
151ce35da
hex143d7a2

21223330 has 8 divisors (see below), whose sum is σ = 38202012. Its totient is φ = 8489328.

The previous prime is 21223297. The next prime is 21223333. The reversal of 21223330 is 3332212.

It can be written as a sum of positive squares in 2 ways, for example, as 21187609 + 35721 = 4603^2 + 189^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21223333) by changing a digit.

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, 1061157 + ... + 1061176.

Almost surely, 221223330 is an apocalyptic number.

21223330 is a deficient number, since it is larger than the sum of its proper divisors (16978682).

21223330 is a wasteful number, since it uses less digits than its factorization.

21223330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2122340.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 21223330 is about 4606.8785527730. The cubic root of 21223330 is about 276.8669877103.

Adding to 21223330 its reverse (3332212), we get a palindrome (24555542).

The spelling of 21223330 in words is "twenty-one million, two hundred twenty-three thousand, three hundred thirty".

Divisors: 1 2 5 10 2122333 4244666 10611665 21223330