21123000200 has 24 divisors (see below), whose sum is σ = 49110975930. Its totient is φ = 8449200000.

The previous prime is 21123000187. The next prime is 21123000229. The reversal of 21123000200 is 200032112.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 11113798084 + 10009202116 = 105422^2 + 100046^2 .

It is a super-2 number, since 2×21123000200² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52807301 + ... + 52807700.

Almost surely, 2^21123000200 is an apocalyptic number.

21123000200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21123000200 is an abundant number, since it is smaller than the sum of its proper divisors (27987975730).

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

21123000200 is a wasteful number, since it uses less digits than its factorization.

21123000200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105615017 (or 105615008 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 21123000200 its reverse (200032112), we get a palindrome (21323032312).

The spelling of 21123000200 in words is "twenty-one billion, one hundred twenty-three million, two hundred", and thus it is an aban number.