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1220121 = 327107181
BaseRepresentation
bin100101001111000011001
32021222200200
410221320121
5303020441
642052413
713241130
oct4517031
92258620
101220121
11763771
124aa109
13339486
1423a917
151917b6
hex129e19

1220121 has 24 divisors (see below), whose sum is σ = 2044224. Its totient is φ = 686880.

The previous prime is 1220099. The next prime is 1220147. The reversal of 1220121 is 1210221.

It is not a de Polignac number, because 1220121 - 215 = 1187353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1220171) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6651 + ... + 6831.

It is an arithmetic number, because the mean of its divisors is an integer number (85176).

21220121 is an apocalyptic number.

It is an amenable number.

1220121 is a deficient number, since it is larger than the sum of its proper divisors (824103).

1220121 is a wasteful number, since it uses less digits than its factorization.

1220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301 (or 298 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1220121 is about 1104.5908744870. The cubic root of 1220121 is about 106.8565054691.

Adding to 1220121 its reverse (1210221), we get a palindrome (2430342).

The spelling of 1220121 in words is "one million, two hundred twenty thousand, one hundred twenty-one".

Divisors: 1 3 7 9 21 63 107 181 321 543 749 963 1267 1629 2247 3801 6741 11403 19367 58101 135569 174303 406707 1220121