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21120112 = 2413591721
BaseRepresentation
bin101000010010…
…0010001110000
31110202000100101
41100210101300
520401320422
62032402144
7344342446
oct120442160
943660311
1021120112
1110a15942
1270a6354
1344b6210
142b3ab96
151cc2c27
hex1424470

21120112 has 40 divisors (see below), whose sum is σ = 44840880. Its totient is φ = 9576960.

The previous prime is 21120109. The next prime is 21120119. The reversal of 21120112 is 21102112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11412 + ... + 13132.

It is an arithmetic number, because the mean of its divisors is an integer number (1121022).

Almost surely, 221120112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21120112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22420440).

21120112 is an abundant number, since it is smaller than the sum of its proper divisors (23720768).

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

21120112 is a wasteful number, since it uses less digits than its factorization.

21120112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1801 (or 1795 counting only the distinct ones).

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

The square root of 21120112 is about 4595.6623026502. The cubic root of 21120112 is about 276.4174178154.

Adding to 21120112 its reverse (21102112), we get a palindrome (42222224).

The spelling of 21120112 in words is "twenty-one million, one hundred twenty thousand, one hundred twelve".

Divisors: 1 2 4 8 13 16 26 52 59 104 118 208 236 472 767 944 1534 1721 3068 3442 6136 6884 12272 13768 22373 27536 44746 89492 101539 178984 203078 357968 406156 812312 1320007 1624624 2640014 5280028 10560056 21120112