21124440200 has 24 divisors (see below), whose sum is σ = 49114323930. Its totient is φ = 8449776000.

The previous prime is 21124440187. The next prime is 21124440241. The reversal of 21124440200 is 204442112.

It can be written as a sum of positive squares in 3 ways, for example, as 19893974116 + 1230466084 = 141046^2 + 35078^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 52810901 + ... + 52811300.

Almost surely, 2^21124440200 is an apocalyptic number.

21124440200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21124440200 is an abundant number, since it is smaller than the sum of its proper divisors (27989883730).

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

21124440200 is a wasteful number, since it uses less digits than its factorization.

21124440200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105622217 (or 105622208 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 21124440200 its reverse (204442112), we get a palindrome (21328882312).

The spelling of 21124440200 in words is "twenty-one billion, one hundred twenty-four million, four hundred forty thousand, two hundred".