21321242200 has 24 divisors (see below), whose sum is σ = 49571888580. Its totient is φ = 8528496800.

The previous prime is 21321242123. The next prime is 21321242207. The reversal of 21321242200 is 224212312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321242207) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53302906 + ... + 53303305.

Almost surely, 2^21321242200 is an apocalyptic number.

21321242200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21321242200 is an abundant number, since it is smaller than the sum of its proper divisors (28250646380).

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

21321242200 is a wasteful number, since it uses less digits than its factorization.

21321242200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106606227 (or 106606218 counting only the distinct ones).

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

Adding to 21321242200 its reverse (224212312), we get a palindrome (21545454512).

The spelling of 21321242200 in words is "twenty-one billion, three hundred twenty-one million, two hundred forty-two thousand, two hundred".