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42123421 = 47219069
BaseRepresentation
bin1010000010110…
…0000010011101
32221021002110201
42200230002131
541240422141
64102503501
71021020544
oct240540235
987232421
1042123421
1121860a4a
1212134b91
13895b202
14584715b
153a71031
hex282c09d

42123421 has 6 divisors (see below), whose sum is σ = 43040990. Its totient is φ = 41225016.

The previous prime is 42123401. The next prime is 42123449. The reversal of 42123421 is 12432124.

It can be written as a sum of positive squares in only one way, i.e., 42068196 + 55225 = 6486^2 + 235^2 .

It is a de Polignac number, because none of the positive numbers 2k-42123421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42123401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7326 + ... + 11743.

Almost surely, 242123421 is an apocalyptic number.

It is an amenable number.

42123421 is a deficient number, since it is larger than the sum of its proper divisors (917569).

42123421 is an equidigital number, since it uses as much as digits as its factorization.

42123421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19163 (or 19116 counting only the distinct ones).

The product of its digits is 384, while the sum is 19.

The square root of 42123421 is about 6490.2558501187. The cubic root of 42123421 is about 347.9428193583.

Adding to 42123421 its reverse (12432124), we get a palindrome (54555545).

The spelling of 42123421 in words is "forty-two million, one hundred twenty-three thousand, four hundred twenty-one".

Divisors: 1 47 2209 19069 896243 42123421