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21431043 = 323496823
BaseRepresentation
bin101000111000…
…0001100000011
31111022210212100
41101300030003
520441243133
62043201443
7350106114
oct121601403
944283770
1021431043
1111108507
127216283
1345948ba
142bbc20b
151d34e13
hex1470303

21431043 has 12 divisors (see below), whose sum is σ = 31049200. Its totient is φ = 14244336.

The previous prime is 21431023. The next prime is 21431057. The reversal of 21431043 is 34013412.

It is not a de Polignac number, because 21431043 - 26 = 21430979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21431023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 271 + ... + 6552.

Almost surely, 221431043 is an apocalyptic number.

21431043 is a deficient number, since it is larger than the sum of its proper divisors (9618157).

21431043 is a wasteful number, since it uses less digits than its factorization.

21431043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7178 (or 7175 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21431043 is about 4629.3674513912. The cubic root of 21431043 is about 277.7672905493.

Adding to 21431043 its reverse (34013412), we get a palindrome (55444455).

The spelling of 21431043 in words is "twenty-one million, four hundred thirty-one thousand, forty-three".

Divisors: 1 3 9 349 1047 3141 6823 20469 61407 2381227 7143681 21431043