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21313256 = 2312792083
BaseRepresentation
bin101000101001…
…1011011101000
31111002211021212
41101103123220
520424011011
62040452252
7346105526
oct121233350
944084255
1021313256
1111037a68
12717a088
1345530c3
142b8b316
151d1008b
hex14536e8

21313256 has 16 divisors (see below), whose sum is σ = 40012800. Its totient is φ = 10643184.

The previous prime is 21313247. The next prime is 21313283. The reversal of 21313256 is 65231312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9191 + ... + 11273.

It is an arithmetic number, because the mean of its divisors is an integer number (2500800).

Almost surely, 221313256 is an apocalyptic number.

It is an amenable number.

21313256 is a deficient number, since it is larger than the sum of its proper divisors (18699544).

21313256 is a wasteful number, since it uses less digits than its factorization.

21313256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3368 (or 3364 counting only the distinct ones).

The product of its digits is 1080, while the sum is 23.

The square root of 21313256 is about 4616.6282068193. The cubic root of 21313256 is about 277.2574771478.

Adding to 21313256 its reverse (65231312), we get a palindrome (86544568).

The spelling of 21313256 in words is "twenty-one million, three hundred thirteen thousand, two hundred fifty-six".

Divisors: 1 2 4 8 1279 2083 2558 4166 5116 8332 10232 16664 2664157 5328314 10656628 21313256