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82171221 = 3112226367
BaseRepresentation
bin1001110010111…
…01010101010101
312201121201201120
410321131111111
5132013434341
612053114153
72015305146
oct471352525
9181551646
1082171221
1142424500
1223628959
1314040732
14acadacd
157332066
hex4e5d555

82171221 has 12 divisors (see below), whose sum is σ = 120427776. Its totient is φ = 49800520.

The previous prime is 82171213. The next prime is 82171231. The reversal of 82171221 is 12217128.

It is not a de Polignac number, because 82171221 - 23 = 82171213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 82171191 and 82171200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82171231) 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, 112821 + ... + 113546.

It is an arithmetic number, because the mean of its divisors is an integer number (10035648).

Almost surely, 282171221 is an apocalyptic number.

It is an amenable number.

82171221 is a deficient number, since it is larger than the sum of its proper divisors (38256555).

82171221 is a wasteful number, since it uses less digits than its factorization.

82171221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226392 (or 226381 counting only the distinct ones).

The product of its digits is 448, while the sum is 24.

The square root of 82171221 is about 9064.8343062629. The cubic root of 82171221 is about 434.7503230964.

Adding to 82171221 its reverse (12217128), we get a palindrome (94388349).

The spelling of 82171221 in words is "eighty-two million, one hundred seventy-one thousand, two hundred twenty-one".

Divisors: 1 3 11 33 121 363 226367 679101 2490037 7470111 27390407 82171221