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21270774 = 23717313
BaseRepresentation
bin101000100100…
…1000011110110
31111000200000110
41101021003312
520421131044
62035523450
7345540630
oct121110366
944020013
1021270774
1111009058
127159586
134539975
142b79a50
151d026b9
hex14490f6

21270774 has 64 divisors (see below), whose sum is σ = 53194752. Its totient is φ = 5535360.

The previous prime is 21270773. The next prime is 21270779. The reversal of 21270774 is 47707212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21270773) 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 31 ways as a sum of consecutive naturals, for example, 686139 + ... + 686169.

It is an arithmetic number, because the mean of its divisors is an integer number (831168).

Almost surely, 221270774 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21270774, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26597376).

21270774 is an abundant number, since it is smaller than the sum of its proper divisors (31923978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21270774 is an equidigital number, since it uses as much as digits as its factorization.

21270774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 60 counting only the distinct ones).

The product of its (nonzero) digits is 5488, while the sum is 30.

The square root of 21270774 is about 4612.0249348849. The cubic root of 21270774 is about 277.0731429397.

Adding to 21270774 its reverse (47707212), we get a palindrome (68977986).

The spelling of 21270774 in words is "twenty-one million, two hundred seventy thousand, seven hundred seventy-four".

Divisors: 1 2 3 6 7 14 17 21 31 34 42 51 62 93 102 119 186 217 238 357 434 527 651 714 961 1054 1302 1581 1922 2883 3162 3689 5766 6727 7378 11067 13454 16337 20181 22134 29791 32674 40362 49011 59582 89373 98022 114359 178746 208537 228718 343077 417074 506447 625611 686154 1012894 1251222 1519341 3038682 3545129 7090258 10635387 21270774