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21120200 = 2352105601
BaseRepresentation
bin101000010010…
…0010011001000
31110202000110122
41100210103020
520401321300
62032402412
7344342633
oct120442310
943660418
1021120200
1110a15a12
1270a6408
1344b627a
142b3ac1a
151cc2c85
hex14244c8

21120200 has 24 divisors (see below), whose sum is σ = 49104930. Its totient is φ = 8448000.

The previous prime is 21120193. The next prime is 21120223. The reversal of 21120200 is 202112.

It can be written as a sum of positive squares in 3 ways, for example, as 20124196 + 996004 = 4486^2 + 998^2 .

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52601 + ... + 53000.

Almost surely, 221120200 is an apocalyptic number.

21120200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120200 is an abundant number, since it is smaller than the sum of its proper divisors (27984730).

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

21120200 is a wasteful number, since it uses less digits than its factorization.

21120200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105617 (or 105608 counting only the distinct ones).

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

The square root of 21120200 is about 4595.6718768859. The cubic root of 21120200 is about 276.4178017259.

Adding to 21120200 its reverse (202112), we get a palindrome (21322312).

The spelling of 21120200 in words is "twenty-one million, one hundred twenty thousand, two hundred".

Divisors: 1 2 4 5 8 10 20 25 40 50 100 200 105601 211202 422404 528005 844808 1056010 2112020 2640025 4224040 5280050 10560100 21120200