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8101221 = 323137857
BaseRepresentation
bin11110111001110101100101
3120020120210020
4132321311211
54033214341
6445345353
7125600502
oct36716545
916216706
108101221
114633627
122868259
1318a852b
14110c4a9
15aa0566
hex7b9d65

8101221 has 16 divisors (see below), whose sum is σ = 11366784. Its totient is φ = 5122304.

The previous prime is 8101217. The next prime is 8101241. The reversal of 8101221 is 1221018.

It is a cyclic number.

It is not a de Polignac number, because 8101221 - 22 = 8101217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8101241) 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, 9025 + ... + 9881.

It is an arithmetic number, because the mean of its divisors is an integer number (710424).

Almost surely, 28101221 is an apocalyptic number.

It is an amenable number.

8101221 is a deficient number, since it is larger than the sum of its proper divisors (3265563).

8101221 is a wasteful number, since it uses less digits than its factorization.

8101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1020.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 8101221 is about 2846.2643939030. The cubic root of 8101221 is about 200.8399755995.

Adding to 8101221 its reverse (1221018), we get a palindrome (9322239).

The spelling of 8101221 in words is "eight million, one hundred one thousand, two hundred twenty-one".

Divisors: 1 3 23 69 137 411 857 2571 3151 9453 19711 59133 117409 352227 2700407 8101221