Search a number
21020200 = 2352227463
BaseRepresentation
bin101000000101…
…1111000101000
31110112221021221
41100023320220
520340121300
62030311424
7343445245
oct120137050
943487257
1021020200
1110957873
127058574
13447c8b6
142b125cc
151ca331a
hex140be28

21020200 has 48 divisors (see below), whose sum is σ = 49193280. Its totient is φ = 8352960.

The previous prime is 21020161. The next prime is 21020227. The reversal of 21020200 is 202012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45169 + ... + 45631.

It is an arithmetic number, because the mean of its divisors is an integer number (1024860).

Almost surely, 221020200 is an apocalyptic number.

21020200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21020200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24596640).

21020200 is an abundant number, since it is smaller than the sum of its proper divisors (28173080).

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

21020200 is a wasteful number, since it uses less digits than its factorization.

21020200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706 (or 697 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 21020200 is about 4584.7791658923. The cubic root of 21020200 is about 275.9808500331.

Adding to 21020200 its reverse (202012), we get a palindrome (21222212).

The spelling of 21020200 in words is "twenty-one million, twenty thousand, two hundred".