21024224200 has 72 divisors (see below), whose sum is σ = 56861971650. Its totient is φ = 7208302080.

The previous prime is 21024224189. The next prime is 21024224201. The reversal of 21024224200 is 242242012.

It can be written as a sum of positive squares in 3 ways, for example, as 14729705956 + 6294518244 = 121366^2 + 79338^2 .

It is not an unprimeable number, because it can be changed into a prime (21024224201) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1062865 + ... + 1082464.

Almost surely, 2^21024224200 is an apocalyptic number.

21024224200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21024224200 is an abundant number, since it is smaller than the sum of its proper divisors (35837747450).

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

21024224200 is a wasteful number, since it uses less digits than its factorization.

21024224200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2145359 (or 2145343 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 21024224200 its reverse (242242012), we get a palindrome (21266466212).

The spelling of 21024224200 in words is "twenty-one billion, twenty-four million, two hundred twenty-four thousand, two hundred".