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21200120 = 235617859
BaseRepresentation
bin101000011011…
…1110011111000
31110220002002122
41100313303320
520411400440
62034220412
7345124634
oct120676370
943802078
1021200120
1110a6aa67
127124708
134513766
142b5bdc4
151cdb7b5
hex1437cf8

21200120 has 32 divisors (see below), whose sum is σ = 47833200. Its totient is φ = 8456448.

The previous prime is 21200117. The next prime is 21200129. The reversal of 21200120 is 2100212.

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

It is a junction number, because it is equal to n+sod(n) for n = 21200098 and 21200107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200129) 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, 24251 + ... + 25109.

Almost surely, 221200120 is an apocalyptic number.

21200120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200120 is an abundant number, since it is smaller than the sum of its proper divisors (26633080).

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

21200120 is a wasteful number, since it uses less digits than its factorization.

21200120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487 (or 1483 counting only the distinct ones).

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

The square root of 21200120 is about 4604.3588044374. The cubic root of 21200120 is about 276.7660229270.

Adding to 21200120 its reverse (2100212), we get a palindrome (23300332).

The spelling of 21200120 in words is "twenty-one million, two hundred thousand, one hundred twenty".

Divisors: 1 2 4 5 8 10 20 40 617 859 1234 1718 2468 3085 3436 4295 4936 6170 6872 8590 12340 17180 24680 34360 530003 1060006 2120012 2650015 4240024 5300030 10600060 21200120