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12111220 = 2251155051
BaseRepresentation
bin101110001100…
…110101110100
3211210022110201
4232030311310
511100024340
61111330244
7204641452
oct56146564
924708421
1012111220
116922380
124080984
132680804
1418739d2
1510e379a
hexb8cd74

12111220 has 24 divisors (see below), whose sum is σ = 27746208. Its totient is φ = 4404000.

The previous prime is 12111217. The next prime is 12111221. The reversal of 12111220 is 2211121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 12111197 and 12111206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27306 + ... + 27745.

It is an arithmetic number, because the mean of its divisors is an integer number (1156092).

Almost surely, 212111220 is an apocalyptic number.

12111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12111220 is an abundant number, since it is smaller than the sum of its proper divisors (15634988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12111220 is a wasteful number, since it uses less digits than its factorization.

12111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55071 (or 55069 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 12111220 is about 3480.1178140977. The cubic root of 12111220 is about 229.6479807215.

Adding to 12111220 its reverse (2211121), we get a palindrome (14322341).

Subtracting from 12111220 its reverse (2211121), we obtain a palindrome (9900099).

The spelling of 12111220 in words is "twelve million, one hundred eleven thousand, two hundred twenty".

Divisors: 1 2 4 5 10 11 20 22 44 55 110 220 55051 110102 220204 275255 550510 605561 1101020 1211122 2422244 3027805 6055610 12111220