21324221200 has 30 divisors (see below), whose sum is σ = 51231442394. Its totient is φ = 8529688320.

The previous prime is 21324221077. The next prime is 21324221221. The reversal of 21324221200 is 212242312.

It can be written as a sum of positive squares in 3 ways, for example, as 5757167376 + 15567053824 = 75876^2 + 124768^2 .

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, 26654877 + ... + 26655676.

Almost surely, 2^21324221200 is an apocalyptic number.

21324221200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21324221200 is an abundant number, since it is smaller than the sum of its proper divisors (29907221194).

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

21324221200 is a wasteful number, since it uses less digits than its factorization.

21324221200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53310571 (or 53310560 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21324221200 its reverse (212242312), we get a palindrome (21536463512).

The spelling of 21324221200 in words is "twenty-one billion, three hundred twenty-four million, two hundred twenty-one thousand, two hundred".