21242403200 has 48 divisors (see below), whose sum is σ = 52475382060. Its totient is φ = 8496960000.

The previous prime is 21242403187. The next prime is 21242403209. The reversal of 21242403200 is 230424212.

It is a super-2 number, since 2×21242403200² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21242403209) 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, 3315926 + ... + 3322325.

Almost surely, 2^21242403200 is an apocalyptic number.

21242403200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21242403200 is an abundant number, since it is smaller than the sum of its proper divisors (31232978860).

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

21242403200 is an equidigital number, since it uses as much as digits as its factorization.

21242403200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6638275 (or 6638258 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 21242403200 its reverse (230424212), we get a palindrome (21472827412).

The spelling of 21242403200 in words is "twenty-one billion, two hundred forty-two million, four hundred three thousand, two hundred".