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51421210 = 255142121
BaseRepresentation
bin1100010000101…
…0000000011010
310120202110122021
43010022000122
5101130434320
65034045054
71163034031
oct304120032
9116673567
1051421210
1127031575
121527978a
13a865269
146b87718
1547aadaa
hex310a01a

51421210 has 8 divisors (see below), whose sum is σ = 92558196. Its totient is φ = 20568480.

The previous prime is 51421193. The next prime is 51421213. The reversal of 51421210 is 1212415.

It can be written as a sum of positive squares in 2 ways, for example, as 44903401 + 6517809 = 6701^2 + 2553^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (51421213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2571051 + ... + 2571070.

Almost surely, 251421210 is an apocalyptic number.

51421210 is a deficient number, since it is larger than the sum of its proper divisors (41136986).

51421210 is a wasteful number, since it uses less digits than its factorization.

51421210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5142128.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 51421210 is about 7170.8583865532. The cubic root of 51421210 is about 371.8611122559.

Adding to 51421210 its reverse (1212415), we get a palindrome (52633625).

The spelling of 51421210 in words is "fifty-one million, four hundred twenty-one thousand, two hundred ten".

Divisors: 1 2 5 10 5142121 10284242 25710605 51421210