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172221 = 3759139
BaseRepresentation
bin101010000010111101
322202020120
4222002331
521002341
63405153
71315050
oct520275
9282216
10172221
11108435
12837b9
136050a
1446a97
1536066
hex2a0bd

172221 has 16 divisors (see below), whose sum is σ = 268800. Its totient is φ = 96048.

The previous prime is 172219. The next prime is 172223. The reversal of 172221 is 122271.

172221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (172219) and next prime (172223).

It is not a de Polignac number, because 172221 - 21 = 172219 is a prime.

172221 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 172221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1170 + ... + 1308.

It is an arithmetic number, because the mean of its divisors is an integer number (16800).

2172221 is an apocalyptic number.

It is an amenable number.

172221 is a deficient number, since it is larger than the sum of its proper divisors (96579).

172221 is a wasteful number, since it uses less digits than its factorization.

172221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208.

The product of its digits is 56, while the sum is 15.

The square root of 172221 is about 414.9951806949. The cubic root of 172221 is about 55.6367862076.

Adding to 172221 its reverse (122271), we get a palindrome (294492).

It can be divided in two parts, 172 and 221, that added together give a palindrome (393).

The spelling of 172221 in words is "one hundred seventy-two thousand, two hundred twenty-one", and thus it is an iban number.

Divisors: 1 3 7 21 59 139 177 413 417 973 1239 2919 8201 24603 57407 172221