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21457192 = 2347149383
BaseRepresentation
bin101000111011…
…0100100101000
31111101010201211
41101312210220
520443112232
62043522504
7350245261
oct121664450
944333654
1021457192
1111126119
127229434
1345a3783
142bc7968
151d3ca47
hex1476928

21457192 has 32 divisors (see below), whose sum is σ = 41472000. Its totient is φ = 10402624.

The previous prime is 21457171. The next prime is 21457193. The reversal of 21457192 is 29175412.

It is a super-2 number, since 2×214571922 = 920822177049728, which contains 22 as substring.

Together with 20014808 it forms an amicable pair .

It is not an unprimeable number, because it can be changed into a prime (21457193) 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 7 ways as a sum of consecutive naturals, for example, 55833 + ... + 56215.

It is an arithmetic number, because the mean of its divisors is an integer number (1296000).

Almost surely, 221457192 is an apocalyptic number.

It is an amenable number.

21457192 is a deficient number, since it is larger than the sum of its proper divisors (20014808).

21457192 is a wasteful number, since it uses less digits than its factorization.

21457192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585 (or 581 counting only the distinct ones).

The product of its digits is 5040, while the sum is 31.

The square root of 21457192 is about 4632.1908423553. The cubic root of 21457192 is about 277.8802168430.

The spelling of 21457192 in words is "twenty-one million, four hundred fifty-seven thousand, one hundred ninety-two".

Divisors: 1 2 4 8 47 94 149 188 298 376 383 596 766 1192 1532 3064 7003 14006 18001 28012 36002 56024 57067 72004 114134 144008 228268 456536 2682149 5364298 10728596 21457192