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21216355 = 537731571
BaseRepresentation
bin101000011101…
…1110001100011
31110220220100221
41100323301203
520412410410
62034423511
7345223156
oct120736143
943826327
1021216355
1110a81186
127131b97
13451ac74
142b63c9d
151ce14da
hex143bc63

21216355 has 16 divisors (see below), whose sum is σ = 26522784. Its totient is φ = 16277760.

The previous prime is 21216263. The next prime is 21216361. The reversal of 21216355 is 55361212.

It is not a de Polignac number, because 21216355 - 217 = 21085283 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 12720 + ... + 14290.

It is an arithmetic number, because the mean of its divisors is an integer number (1657674).

Almost surely, 221216355 is an apocalyptic number.

21216355 is a deficient number, since it is larger than the sum of its proper divisors (5306429).

21216355 is a wasteful number, since it uses less digits than its factorization.

21216355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1686.

The product of its digits is 1800, while the sum is 25.

The square root of 21216355 is about 4606.1214703913. The cubic root of 21216355 is about 276.8366538147.

Adding to 21216355 its reverse (55361212), we get a palindrome (76577567).

The spelling of 21216355 in words is "twenty-one million, two hundred sixteen thousand, three hundred fifty-five".

Divisors: 1 5 37 73 185 365 1571 2701 7855 13505 58127 114683 290635 573415 4243271 21216355